plural of number four

plural of number one

plural of number two

(set theory) For a given set X, the cardinality of the least ordinal number α such that there is no injection from α into X.

plural of number system

(manufacturing) A manufacturer's identifier for a particular type or version of a product.

plural of amicable number

(US) A number used by a banking institution to designate a certain geographic area in order to sort inquiries and transactions and direct them to the correct district. It is usually shown at the bottom left of a check.

plural of routing number

plural of Bates number