A letter bank is a type of puzzle where all the letters of one word (the "bank") can be used as many times as desired (a minimum of once each) to make a new word or phrase. For example, IMPS is a bank of MISSISSIPPI, and CYNDI LAUPER is a letter bank of PERPENDICULARLY.
Word Ways: Vol. 44
, Article 20.
Available at: http://digitalcommons.butler.edu/wordways/vol44/iss3/20