What is meant by moment of particles?

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What is meant by moment of particles ? Why the algebraic sum of moments of all particles about centre of mass must be zero ?
 
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Can you give the context in which this term "moment" is used? And in what context is this "moment" zero about the center of mass? The "moment" of particles is not a standard physics term.
 
Moment refers to moment arm ... the lever arm times the mass.

See https://en.wikipedia.org/wiki/Moment_(physics )

If the sum of the forces is zero, and the sum of the moments is zero, then there will be no net force on the system.
 
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