extra, scraps
You call the bits of soil sediment.
An organism's remnant or leftover is referred to as a fossil.
8 Bits is one Byte. Half of a byte (4 bits) is a nibble.
asteroids belt
Small leftover pieces of cigarette are called cigarette butts.
16 bits is a byte, for the record half a byte is called a "nibble". I kid you not...
chicken mic bites
Gold dust
Smaller rocks.
Datum
silt