FLY-insect: The American Sign Language (ASL) sign for "fly / insect"
For other meanings of "fly" (such as "flying" see:  FLY)
 

FLY-(insect)
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."

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.

FLY-("buzzing around")
 

Sample sentence: HOUSE F-L-Y KNOW BUG-[buzz-around] F-L-Y FAST SLOW WHICH?

Some types of FLIES:

FRUIT FLY:

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SAND FLY:

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HORSE FLY:

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DRAGON FLY:

Version 1:

Version 2:

If you want to learn more animal signs, check out:

Notes: 

Also see: "FIREFLY"

Also see: INSECTS

ANIMALS