1)a set of n points,n元集2)n-number sets,n元数集3)n-ary truth-value fuctional set,n元真值函数集4)n-dimensional element developable multitude,n维物元可拓集5)r-repeatable combination on the set with n elements,n元集的r-可重组合6)collection,n.收集，集成
用法例句
The problem of different distances determined by a set of n points is a very important problem raised by P Erds.