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A mental device used to aid memorization. Common mnemonics for mathematical constants such as e and Pi consist of sentences in which the number of letters in each word give successive digits.
See also e, Josephus Problem, Pi
References
 
Luria, A. R.  The Mind of a Mnemonist: A Little Book about a Vast Memory.  Cambridge, MA: Harvard University Press, 1987.
 
 Calculating Prodigies