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A score is another name for a set whose cardinality is $20$.

Historical Note

Biblical language often uses the word score when discussing ages:

The days of our years are three score years and ten; and if by reason of strength they be fourscore years, yet is their strength labor and sorrow; for it is soon cut off, and we fly away.
-- Psalm $90$: $10$

The term a score or scores is used in colloquial language to mean a moderately large number.