lipograms
A lipogram is a form of constrained writing in which a text deliberately omits one or more letters. The constraint may target a single letter, commonly the letter e in English, or a broader set of letters, a vowel, or even all but one letter. Lipograms can span an entire work or be limited to shorter passages. The term lipogram derives from Greek lipos and graphein, meaning to write while omitting a character.
The modern lipogram tradition is closely associated with the Oulipo group, founded in 1960 in Paris by
Variations and significance: Lipograms appear in many languages and can be used for puzzles, for experimental