NXC  Version 1.2.1 r5
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#define NA   0xFFFF

The specified argument does not apply (aka unwired)

Examples:
ex_ArrayMax.nxc, ex_ArrayMean.nxc, ex_ArrayMin.nxc, ex_ArrayOp.nxc, ex_ArraySort.nxc, ex_ArrayStd.nxc, ex_ArraySum.nxc, and ex_ArraySumSqr.nxc.