A B C D E F G H I J K L M N O P Q R S T U V W X Y and Z Special characters and Numerics

This site contains terms and definitions from many IBM software and hardware products as well as general computing terms.


See You Ain't Gonna Need It.

To copy a word or line of text into memory.

yard management
The management and visibility of trucks, trailers and inventory within a yard (normally associated with a warehouse or cross dock facility) to ensure timely shipping, loading, unloading and receipt of material and orders. This may involve dock door management as well as gate check-in and check-out.

See Yet Another Resource Negotiator.


  1. In a system of coordinates, the second component that is used to locate points in space (X-axis, Y-axis, and Z-axis).
  2. In printing, an axis parallel with the direction in which the paper moves through the printer. See also X-axis.

Ybc extent
In architecture, the size of a bar code presentation space in the Ybc dimension.


  1. The vertical or baseline position that defines a page origin or the starting point of a line or field.
  2. The vertical, or y-axis, positioning information of an object on a map. The Y-coordinate is measured along the north-south axis from an origin (0,0).

yellow alarm
See remote alarm indication.

Yet Another Resource Negotiator (YARN)
The Apache Software Foundation's approach to a MapReduce programming model. See also MapReduce.

A measurement along the Y-axis.

Y field
A secondary data field in a chart. In a line chart, typically the Y fields appear along the vertical axis. For example, an Y field can represent resources whose costs are represented along the vertical axis of the chart.

yielding loop
A loop characterized by returning control at some point to a CICS routine that can suspend the looping task. However, the looping task will eventually be resumed and so the loop will continue.

A distance perpendicular to the direction of the linear asset. For example, a speed limit sign is located 10 feet from the right edge of the road. "Right" is positive and "left" is negative. Therefore, the Y-offset is 10.

A field in which a user can enter Y (for "yes") or N (for "no").

Approximately 1,000 zettabytes. It would take approximately 11 trillion years to download a yottabyte file from the Internet using high-power broadband. The entire Internet almost takes up a yottabyte. See also brontobyte, zettabyte.

You Ain't Gonna Need It (YAGNI)
In extreme programming, the principle of only writing code when it is immediately necessary.

Yp extent
In architecture, the size of a presentation space of logical page in the Yp dimension.

Yp orientation
In printing, the orientation of a font along the Y-axis.


An IBM architecture for mainframe computers and peripherals. The zSeries family of servers uses the z/Architecture. It is the successor to the S/390 and 9672 family of servers. See also Enterprise Systems Architecture/390.

In 3D computer graphics, the device and the techniques used as an aid in removing hidden lines and hidden surfaces. If the z-buffer is enabled, each pixel stores a depth value as well as a color value. A drawing routine will update a pixel only if its depth value has been reduced. A z-buffer is the region of memory that stores the depth values, or z-values.

A logical group of z/OS artifacts that share a common context; for example, all of the artifacts in a zComponent might comprise part of some application.

zComponent project

  1. An Eclipse integrated development environment (IDE) project with specific z/OS Rational Team Concert components.
  2. A container into which buildable artifacts, such as COBOL programs, can be grouped.

See zero code suppression.

See zSeries entry license charge.

A standard Japanese EDI communication protocol. The Zengin TCP/IP adapter enables Sterling B2B Integrator to communicate with Zengin servers.

A heterogeneous hardware infrastructure that can consist of an IBM zEnterprise BC12 (zBC12), a zEnterprise EC12 (zEC12), a zEnterprise 114 (z114), or a zEnterprise 196(z196), and an attached IBM zEnterprise BladeCenter Extension (zBX), managed as a single logical virtualized system by the Unified Resource Manager.

A feature that provides the ability to automatically declare records without user involvement.

zero code suppression (ZCS)
A coding method used with alternate mark inversion to prevent sending eight successive zeros. If eight successive zeros occur, the second-least significant bit (bit 7, with the bits labeled 1 through 8 from the most significant to the least significant) is changed from a 0 to a 1. AMI with ZCS does not support clear channel operation.

zero configuration networking
A set of techniques or technologies used by an application to automatically discover devices on a network and configure network settings.


  1. To erase electronically stored data, cryptographic keys, or CSPs from a cryptographic module.
  2. To delete secret material stored on a card, and set, reset, or initialize a variable or parameter to zero.

zero suppression

  1. The substitution of blanks for leading zeros in a number. For example, 00057 becomes 57 with zero suppression.
  2. The ability in a cube view to turn off the display of rows or columns that contain only zero values so those rows or columns do not display.

Approximately 1,000 exabytes. See also exabyte, yottabyte.

An artifact that represents a PDS member on MVS. A zFile can be associated with a language definition for Ant builds or for Rational Developer for System z integration syntax checking.

A container for a group of artifacts within a zComponent Project, used to represent a partitioned data set (PDS). Each zFolder is associated with a data set definition to create the source PDS on z/OS.

Z format
The format of a pixmap organized as a set of pixel values in scanline order.

See z/OS file system.

zFS aggregate
A Virtual Storage Access Method Linear Data Set (VSAM LDS) that contains zFS file systems. See also aggregate.

z Global Mirror
A method of an asynchronous replication function that maintains data consistency across multiple volumes that are attached to a z/OS system. Time-based data consistency is maintained through the Data Facility Storage Management Subsystem (DFSMS) system data mover (SDM) component.

zigzag join
A join method in which a fact table and two or more dimension tables in a star schema are joined, such that the fact table is accessed using an index. The feedback from the fact table index allows the zigzag join to avoid lookups in the index over the fact table for unproductive dimension key combinations.

See System z new application license charge.

A distance above or below a linear asset. For example, an exit sign is located 18 feet above the surface of the road, and a culvert is 4 feet below the surface of the road. The Z-offset for the sign is 18, and the Z-offset for the culvert is -4.

zombie process

  1. A completed operation whose entry remains in the process table without a designated user or kernel space. A process becomes a zombie process if it issues an exit subroutine when its parent process is not running a wait subroutine and has not indicated that it does not intend to wait for its children to finish.
  2. A process that terminated but has not been cleaned up by its parent process. The existence of a large number of zombie processes could indicate an errant network daemon or application. Zombie processes are sometimes called lingering terminated processes.


  1. An interested area of the site. A site can be divided into many zones, and each zone can be of special interest in the analysis report. For example, in a retail store, a zone can be the women's clothing department, or an entire floor of the site.
  2. A group of locations in a warehouse used to distinguish storage types or the kind of item stored in those locations.
  3. A part of a keyboard section defined in ISO/IEC 9995 (see ISO/IEC 9995-1).
  4. An area of interest on a web page on which zone rules can be defined and run.
  5. A function that enables rules-based shard placement to improve grid availability by placing shards across different data centers, whether on different floors or even in different buildings or geographies.
  6. A logical section within an area. A zone can overlap areas but belongs only to the area where it was created. Zones are the units on which rules can be defined and run.
  7. A logical grouping of switches, switch ports, and their attached devices in a fabric.
  8. A collection of Fibre Channel device ports that are permitted to communicate with each other using the fabric. Types of device ports for zone purposes are node ports (N_ports) or node loop ports (NL_ports). Any two N_ports or NL_ports that are not members of at least one common zone are not permitted to communicate using the fabric. See also zoning.

zone alias

  1. An alias for a set of port numbers or worldwide names (WWNs). Zone aliases can be used to simplify the entry of port numbers and WWNs. For example, "host" could be used as an alias for a WWN of 110:00:00:60:69:00:00:8a.
  2. A name that is given to a collection of one or more zone members to be managed together.

zone configuration
The set of groups of fabric ports (F_ports) that define the zones for a given fabric. See also defined zone configuration, enabled zone configuration.

zoned decimal format
A format for representing numbers in which the digit is contained in bits 4 through 7 and the sign is contained in bits 0 through 3 of the least significant byte; bits 0 through 3 of all other bytes contain 1's (hex F). For example, in zoned decimal format, the decimal value of +123 is represented as 1111 0001 1111 0010 1111 0011. See also packed decimal format.

zone group
A group of stores that share an established price for a given product.

zone map
An automatically generated internal table that improves the throughput and response time of SQL queries by filtering out data that does not match the query.

zone of authority
The set of names managed by a single name server.

zone population function
The JavaScript function that is used to render the recommendations from Digital Recommendations on a client's web page.

zone price
An established product price for a group of stores in a given zone.

zone set
A group of zones that function together on a fabric.

zone skipping
The process of consolidating parcel shipments into a single load and dropping them as an LTL shipment to a break bulk node. The consolidated shipments are later shipped to different destinations as parcels within the same region, thus saving transportation costs. See also break bulk node.

zone transfer
The act of a secondary name server obtaining domain information from a master name server.

zone visit
A device that enters and exits different zones.

zone width
The number of positions to the left of the right margin in which to end words.

The grouping of multiple ports to form a virtual, private, storage network. Ports that are members of a zone can communicate with each other, but are isolated from ports in other zones. See also Fibre Channel, zone.


  1. To progressively increase or decrease the size of a part of an image on a display or window.
  2. To retrieve progressively detailed data relative to a selected dimension. See also drill down.

zoom factor
A multiplier that determines the amount of enlargement for a specified screen rectangle. The x zoom factor determines the enlargement in the x direction; the y zoom factor determines the enlargement in the y direction.

In VisualAge RPG, the order in which controls are placed on other controls. This order determines the relationship between controls.

An IBM mainframe operating system that uses 64-bit real storage. See also Base Control Program.

z/OS file system (zFS)
A type of file system that resides in a Virtual Storage Access Method (VSAM) linear data set (LDS) and has a hierarchical organization of files and directories with a root directory.

z/OS network
A connected group of workstations that use the Tivoli Workload Scheduler z/OS engine to perform workload scheduling. See also engine, workstation.

z/OS Network File System
A base element of z/OS that allows remote access to z/OS host-processor data from workstations, personal computers, or any other system on a Transmission Control Protocol/Internet Protocol (TCP/IP) network that is using client software for the Network File System (NFS) protocol.

z/OS project
An Eclipse-based project that contains z/OS-based resources, MVS subprojects, and z/OS UNIX System Services subprojects. See also MVS subproject.

z/OS workstation
A representation of system configuration elements in the Tivoli Workload Scheduler for z/OS network. For the z/OS engine, workstations can be a computer, general, or a printer. See also workstation.

zSecure configuration
A file that determines the devices, optional features, and program components that are accessible to a user or group of users.

See System z.

zSeries entry license charge (zELC)

zSeries storage
Storage arrays and logical volumes (LVOLs) that are defined in the ESS as connected to zSeries servers. See also S/390 storage.

An IBM mainframe operating system that acts as a hypervisor. z/VM can virtualize all system resources, including processors, memory, storage devices, communication devices, and networking, and can dynamically add or increase system resources. z/VM supports the concurrent operation of hundreds of operating system instances.

z/VM virtual server
In z/VM, a guest virtual machine that a user can log on to.