countably infinite set
set with the same cardinality as the set of natural numbers
set of non-negative integers
the set of positive integers and zero
set of integers
the set of all integers
set of positive integers
set of integers greater than 0
recursively enumerable set
a set that can be output (enumerated) by an algorithm (mathematical logic, computability theory)
stock
countable quantity of goods or holdings
stock
number or countable quantity of material flow objects that are in a production, transportation, handling, or storage process