The sign for "zero" shows an "O" handshape and moves it
forward with a firm stop.
The sign for "none" can be used for an emphatic "zero!"
If for some reason you need to emphasize that the handshape you are
doing is a "zero" and not an "O" (as in the alphabet letter coming
after "n" and preceding the letter "P" then you can show the "zero"
against your palm. If the context is clear, you don't need to
use this method, but if you are talking about both letters and
numbers (as in a password or some sort of product number that mixes
letters and numbers) then using the palm is a good way to
distinguish between letters and numbers. This version is also good
for talking about grades. For example, if a student got a "zero" on
ZERO (palm version)
Also see: ZILCH
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