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Indicates a lack of data in a tableJoan G. Nagle, Handbook for preparing engineering documents: from concept to completion, 1995, p. 114: We can use the word none or N/D (no data), or insert an em dash; any of these entries show that we haven't simply forgotten to fill the cell. N/A is commonly used for not applicable. It's good practice to footnote N/A or N/D the first time it is used.
(alternative form of)
Indicates zero (omission) of the present tense of (l). Called (m) in Russian.