Movable letter

(Heb. Gram.) a letter that is pronounced, as opposed to one that is quiescent.

See also: Movable

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The FBF began as far back as 1454-soon after Johannes Gutenberg developed printing in movable letters in Mainz near Frankfurt-when a local group began to sell books.
There's something about that type of sign with movable letters that inspires strange messages.