For more "fly" versions, as in
"flying" see: FLY
As in a bug that flies around and bothers people.
Version 1: Spell it.
Because the word "fly" is so short (three letters) this concept is
often just spelled out. But, if for some reason, (maybe you are telling a
story), and you need an actual sign for fly here is a sign that works pretty good for
indicating the insect known as a "fly."
If you want to talk about a fly buzzing around, I'd use an "F"
handshape. Pretend you are holding a fly between your index finger and thumb.
Then wiggle your hand around as if the imaginary fly between your finger and
thumb were buzzing around in the air.