Avogadro’s Constant / Number

Avogadro’s number: 6.02214076 * 10^2$$^3 often rounded to 6.022 * 10^2$$^3

Mole

A mole is saying you have Avogadro number of something

if you say you have 1 mole of lithium atoms you have 6.022 * 10^2$$^3 Li atoms