#6.022xx10^23# individual items of that substance.
Explanation:
#"Avogadro's constant",# often given the symbol #N_A# or less commonly #L#, has the value #6.022140857(74)xx10^23* mol^-1#.
#"Avogadro's number"# of #""^1H# atoms have a mass of #1.00*g#. And thus it is the link between the micro world of atoms and molecules, and the benchtop world of grams, and kilograms, and litres.