After a byte is a kilobyte wich is actually 1,024 bytes(2,048 nybbles).
And the list goes on in the aspect that each unit up equals 1,024 of the previous i.e. 1024 kilobytes = 1 megabyte. This is the scale up to the highest measurement I know: bit, nybble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte, exabyte, zettabyte, yottabyte, bronobyte, nisabyte, and zotzabyte.
Half of a byte or 4 bits. Used to conserve space for anything using numbers 0-15.
Also spelled "nibble" though the original spelling was with a "y."