Memory device like "How I wish I could calculate pi," e.g (8)

I believe the answer is:

mnemonic

(Other definitions for mnemonic that I've seen before include "Verse or other aid to help one remember facts" , "That which helps memory, a rhyme say" , "reminder" , "System for improving memory" , "Aid to remembering" .)

I've seen this clue in The New York Times.

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