non-negative integer; whole number; natural number
Mathematics term for integers greater than or equal to zero. In some contexts, 'natural number' may exclude zero, but this term explicitly includes it.
See also: 整数
A non-negative integer is an integer greater than or equal to zero.
In this problem, the solution must be a non-negative integer.
整数 means 'integer' and includes negative numbers, while 非負整数 is specifically non-negative (zero or positive).
自然数 often means 'natural number' (1, 2, 3, ...), but may include zero depending on the field. 非負整数 unambiguously includes zero.
Compound of 非 (non-), 負 (negative), and 整数 (integer). A straightforward modern mathematical coinage.