#x
If x is a list, #x is the number of elements in x.
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If x is a set, #x is the cardinality of x.
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If x is a hash table, #x is the number of key-value pairs stored in x.
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If x is a string, #x is the number of characters in x.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Macaulay2Doc/ov_hashtables.m2:758:0.