Peta-
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Peta-

Peta is a decimal unit prefix in the metric system denoting multiplication by one quadrillion, or 1015 (1000000000000000). It was adopted as an SI prefix in the International System of Units in 1975,[1] and has the symbol P.

Peta is derived from the ancient Greek , meaning "five". It denotes the fifth power of 1000 (10005). It is similar to the prefix penta ("five"), but without the letter n (on the analogy of the prefix tera [from the Greek for "monster"] for 10004 looking like tetra- ["four"] with a letter missing).

Examples:

Prefix Base 10 Decimal English word Adoption[nb 1]
Name Symbol Short scale Long scale
yotta Y  1024 1000000000000000000000000  septillion  quadrillion 1991
zetta Z  1021 1000000000000000000000  sextillion  trilliard 1991
exa E  1018 1000000000000000000  quintillion  trillion 1975
peta P  1015 1000000000000000  quadrillion  billiard 1975
tera T  1012 1000000000000  trillion  billion 1960
giga G  109 1000000000  billion  milliard 1960
mega M  106 1000000  million 1873
kilo k  103 1000  thousand 1795
hecto h  102 100  hundred 1795
deca da  101 10  ten 1795
100 1  one -
deci d  10-1 0.1  tenth 1795
centi c  10-2 0.01  hundredth 1795
milli m  10-3 0.001  thousandth 1795
micro ?  10-6 0.000001  millionth 1873
nano n  10-9 0.000000001  billionth  milliardth 1960
pico p  10-12 0.000000000001  trillionth  billionth 1960
femto f  10-15 0.000000000000001  quadrillionth  billiardth 1964
atto a  10-18 0.000000000000000001  quintillionth  trillionth 1964
zepto z  10-21 0.000000000000000000001  sextillionth  trilliardth 1991
yocto y  10-24  0.000000000000000000000001  septillionth  quadrillionth 1991
1. ^ Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.

## References

1. ^ "Resolution 10 of the 15th meeting of the CGPM (1975)". International Bureau of Weights and Measures. Retrieved .

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