(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself

(number theory) deficient number, a number for which the sum of proper divisors is less than that number

(number theory) amicable numbers, two different numbers related in such a way that the sum of the proper divisors of each is equal to the other number.

(Internet) play count

unlucky number

(of size or amount) small, little, tiny / (of age) young, little

point (at, to) / indicate; specify; point out / (shogi, chess) play (the game or a move); move (a piece); make (a move)

zero-sum

zero (number) / (informal) Used to refer to something measurable being absent or missing.

to lose / to defeat / to carry