IBM 5170 Technical Reference page 418

gram (g). A unit of weight (equivalent to 0.035 ounces).
graphic. A symbol produced by a process such as handwriting,
drawing, or printing.
graphic character. A character, other than a control character,
that is normally represented by a graphic.
half-duplex.
(1)
In data communication, pertaining to an
alternate, one way at a time, independent transmission.
(2)
Contrast with duplex.
hardware.
(1)
Physical equipment used in data processing, as
opposed to programs, procedures, rules, and associated
documentation.
(2)
Contrast with software.
head. A device that reads, writes, or erases data on a storage
medium; for example, a small electromagnet used to read, write,
or erase data on a magnetic disk.
hertz
(Hz).
A unit of frequency equal to one cycle per second.
hex. Common abbreviation for hexadecimal.
hexadecimal.
(1)
Pertaining to a selection, choice, or condition
that has 16 possible different values or states. These values or
states are usually symbolized by the ten digits 0 through 9 and the
six letters
A
through
F. (2)
Pertaining to a fixed radix
numeration system having a radix of 16.
high impedance state. A state in which the output of a device is
effectively isolated from the circuit.
highlighting. In computer graphics, emphasizing a given display
group by changing its attributes relative to other display groups in
the same display field.
high-order position. The leftmost position in a string of
characters. See also most-significant digit.
Glossary-16