unit prefix
designation that is prepended to units of measurement to indicate multiples or fractions of the units
SI prefix
standardized prefix of the SI (Système International) for measurement units, indicating a multiple or fraction as a power of 10 or 1000
binary prefix
unit prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2
micri-
obsolete metric unit prefix for 10^-14