The ASL sign for the letter "Z" is done by simply drawing a "Z" in the air.
If you are right handed, pretend you have paint on the tip of your index finger and are drawing a Z on a wall.
If you are a leftie -- do a mirror image (see below).
Right handed Z:

Left-handed Z:

Left-handed signers should do a mirror version of the Z done by right-handed signers:

ZZ or "double-Z"
When spelling two z's in a row (as in "zz") in ASL it is common to use a "V" handshape or a "bent-V" handshape (both versions show up -- do whichever seems to fit the particular word your are spelling based on the letters before and after).
PIZZA (spelled version)
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See
also: "Double Z"
Notes:
index-old.htm
Link to Z graphic:
