This article is about the use of n/a to represent "not applicable" etc. For other uses of NA, Na, na and N/A, see Na
n/a or N/A is a common abbreviation in tables and lists for not applicable, not available  or no answer. It is used to indicate when information in a certain table cell is not provided, either because it does not apply to a particular case in question or because the answer is not available.
NA is an initialism which carries the same latter meaning.