An integer that is either 0 or negative, i.e., a member of the set 
,
where Z-- denotes the negative
integers.
Nonpositive Integer
See also
Negative Integer, Nonnegative Integer, Nonpositive Matrix, Positive Integer, Z--Explore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Nonpositive Integer." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NonpositiveInteger.html