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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
meta bit
alt bit
The most-signigicant bit of an 8-bit character,
which is on in character values 128--255. Also called the {high
bit}, "alt bit" (alternate bit) or hobbit. Some terminals and
consoles (see space-cadet keyboard) have a META shift key.
Others (including, *mirabile dictu*, keyboards on IBM PC-class
machines) have an ALT key. See also bucky bits.
Historical note: although, in modern usage shaped by a universe of
8-bit bytes, the meta bit is invariably hex 80 (octal 0200),
things were different on earlier machines with 36-bit words and
9-bit bytes. The MIT and Stanford keyboards (see {space-cadet
keyboard}) generated hex 100 (octal 400) from their meta keys.
[Jargon File]
(2014-10-05)