Gigabit	Amount of memory equal to 1024 Megabits (1,073,741,824 bits) of information. Abbreviated Gb.
Gigabyte	Amount of memory equal to 1024 Megabytes (1,073,741,824 bytes) of information. Abbreviated GB.
HPM	Hyper page mode, also known as EDO.
I/O Port	Connection to a CPU that provides a data path between the CPU and external devices, such as a keyboard, display, or reader. It may provide input only, output only, or both input and output.
IC	Integrated circuit. A tiny complex of electronic components and their connections that is produced in or on a small slice of material (such as silicon).
JEDEC	Joint Electron Device Engineering Council. The group that establishes the industry standards for memory operation, features, and packaging.
Keys	Notches on a memory module that help prevent it from being installed incorrectly or into an incompatible system.
L1 Cache	Level 1 cache. A small cache integrated in a processor that provides quick access to the most recently used data.
L2 Cache	Level 2 cache. L2 cache has the same purpose as L1 cache, but is usually not integrated into the processor. L2 cache is traditionally made of SRAM and in socket 7 and older motherboards was in some cases upgradeable. See COAST.
Latency (also called CAS Latency)	The amount of time in nanoseconds (often measured in clock cycles) between a request to read the memory, and when it is actually output. SDRAMs are typically referred to as CL2 or CL3, with CL2 parts being faster.
Lead	The official name for the metal "feet" on an IC. Also called "pins." The part of the lead assembly that is formed after a portion of the lead frame is cut away. The chip's connection to the outside world.