Names for Large Numbers

Scientists have given names to some large numbers. These can be used as prefixes to units. So kilogram means 1000 grams. Here is a list of all the prefixes for large numbers. See the page Small Numbers for information on numbers less than 1.

prefix	symbol	multiply by
yotta	Y	10²⁴
zetta	Z	10²¹
exa	E	10¹⁸
peta	P	10¹⁵
tera	T	10¹²
giga (=billion)	G	10⁹
mega (=million)	M	10⁶
kilo (=thousand)	k	10³
hecto or hect	h	10²
deca or dec	da	10