Wikipedia:
letter bank
A letter bank is a type of anagram where all the letters of one word (the "bank") can be used as many times as desired (minimum of once each) to make a new word or phrase. For example, IMPS is a bank of MISSISSIPPI, and SPROUT is a bank of SUPPORT OUR TROOPS.
The term "letter bank" was coined by Will Shortz at the 1980 convention of the National Puzzlers League. This puzzle type is the basis for the word game Alpha Blitz.
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