What is the difference between moment of couple and couple?

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Couple: 

The couple is a system of two forces that are equal in magnitude, opposite in direction and have a line of action are parallel. 


Moment of a couple:

Moment of a couple is the product of the magnitude of one of the forces that make up the couple and the perpendicular distance between their parallel lines of action. It is a measure of the capacity of the couple to cause rotation. 

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