It's the number of mappings, *or* he number of available objects to map something to, *or*...
See also http://en.wikipedia.org/wiki/Cardinality
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North, South, East,Westnorth south east west.The four cardinal directions are, north, east, south , and west.
a cardinal is a type of bird that is read with a black looking mask around its eyes
A mapping is a relationship between two sets. Given sets A and B (which need not be different) a mapping allocates an element of B to each element of A.
A relation is a mapping or pairing of input values with output values.
It is simply a mapping. It could be a function but there are several conditions that need to be met before the mapping can become a function and there is no basis for assuming that those conditions are met.