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Wiktionary
n/a

init. 1 Not applicable 2 Not available 3 No answer 4 No assignment 5 Nothing added 6 Non-assessable

Wikipedia
N/a

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.