0
Numeric zero, as opposed to the letter ?O? (the 15th letter of the English
alphabet). In their unmodified forms they look a lot alike, and various
kluges invented to make them visually distinct have compounded the
confusion. If your zero is center-dotted and letter-O is not, or if
letter-O looks almost rectangular but zero looks more like an American
football stood on end (or the reverse), you're probably looking at a modern
character display (though the dotted zero seems to have originated as an
option on IBM 3270 controllers). If your zero is slashed but letter-O is
not, you're probably looking at an old-style ASCII graphic set descended
from the default typewheel on the venerable ASR-33 Teletype (Scandinavians,
for whom ? is a letter, curse this arrangement). (Interestingly, the
slashed zero long predates computers; Florian Cajori's monumental A History
of Mathematical Notations notes that it was used in the twelfth and
thirteenth centuries.) If letter-O has a slash across it and the zero does
not, your display is tuned for a very old convention used at IBM and a few
other early mainframe makers (Scandinavians curse this arrangement even
more, because it means two of their letters collide). Some Burroughs/Unisys
equipment displays a zero with a reversed slash. Old CDC computers rendered
letter O as an unbroken oval and 0 as an oval broken at upper right and
lower left. And yet another convention common on early line printers left
zero unornamented but added a tail or hook to the letter-O so that it
resembled an inverted Q or cursive capital letter-O (this was endorsed by a
draft ANSI standard for how to draw ASCII characters, but the final
standard changed the distinguisher to a tick-mark in the upper-left
corner). Are we sufficiently confused yet?
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zero
0
1. 0, ASCI character 48. Numeric zero, as
opposed to the letter "O" (the 15th letter of the English
alphabet). In their unmodified forms they look a lot alike,
and various kluges invented to make them visually distinct
have compounded the confusion.
If your zero is centre-dotted and letter-O is not, or if
letter-O looks almost rectangular but zero looks more like an
American football stood on end (or the reverse), you're
probably looking at a modern character display (though the
dotted zero seems to have originated as an option on IBM
3270 controllers). If your zero is slashed but letter-O is
not, you're probably looking at an old-style ASCII graphic
set descended from the default typewheel on the venerable
ASR-33 Teletype (Scandinavians, for whom slashed-O is a
letter, curse this arrangement).
If letter-O has a slash across it and the zero does not, your
display is tuned for a very old convention used at IBM and a
few other early mainframe makers (Scandinavians curse *this*
arrangement even more, because it means two of their letters
collide). Some Burroughs/Unisys equipment displays a zero
with a *reversed* slash. And yet another convention common on
early line printers left zero unornamented but added a tail
or hook to the letter-O so that it resembled an inverted Q or
cursive capital letter-O.
[Jargon File]
(1995-01-24)
2. To set to zero. Usually said of small pieces of data, such
as bits or words (especially in the construction "zero out").
3. To erase; to discard all data from. Said of disks and
directories, where "zeroing" need not involve actually writing
zeroes throughout the area being zeroed. One may speak of
something being "logically zeroed" rather than being
"physically zeroed".
See scribble.
(1999-02-07)
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