what is tetrad ,traid,diad axsis?

A molecule is said to posses an  n fold axis of rotation if the molecule upon a rotation of 360/n degree produces the identical configuration. 
Depending on the value of n the rotation axis is named as monad , diad , triad etc
when n =1 monad
n= 2 diad
n=3 triad
n= 4 tetrad
n=5 does not exist in crystals
and n=6 is termed hexad.

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