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Avogadro’s number
A·vo·ga·dro's num·ber or A·vo·ga·dro's con·stant


noun 
Definition:
 
atoms or molecules in mole: the number of atoms or molecules, 6.022 x 1023mole-1, contained in one mole of a substance.
Symbol  NA
[Late 19th century. After Amedeo Avogadro]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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