Look up block letter or block letters in Wiktionary, the free dictionary.

Block letters are a form of handwriting. It can also refer to:

• A style of business letter format.
• The letters at the start and finish of the serial number on a piece of U.S. currency, most commonly Federal Reserve Notes. Originally these letters were not actually letters, but rather a collection of elaborate symbols.
• A typeface or hand lettering having discrete sans-serif glyphs.

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