A pangram (Greek: pan gramma, "every letter"), or holoalphabetic sentence, is a sentence using every letter of the alphabet at least once. Pangrams are used to display typefaces and test equipment. For example, the pangram The quick brown fox jumps over the lazy dog was utilized by Western Union to test Telex/TWX data communication equipment for accuracy and reliability[citation needed] and is now used by a number of computer programs (most notably the font viewer built into Microsoft Windows) to display computer fonts.

Short pangrams tend to be more interesting and more difficult to write because the English language uses some of the same letters (especially vowels) again and again. Longer pangrams may afford more opportunity for humor, cleverness, or thoughtfulness. In a sense, the pangram is the opposite of the lipogram, in which the aim is to omit one or more letters.

A perfect pangram in the English language contains every letter of the alphabet only once and can be considered an anagram of the alphabet. These typically are almost meaningless, for example, "Cwm fjord bank glyphs vext quiz". See the list for more examples.

Ideographic scripts, that is, writing systems composed principally of logograms, cannot be used to produce pangrams in the literal sense, since they are radically different from alphabets or other phonetic writing systems. In such scripts, the total number of signs is large and imprecisely defined, so producing a text with every possible sign is impossible. However, various analogies to pangrams are feasible, including traditional pangrams in a romanization.

In addition, it is possible to create pangrams that demonstrate certain aspects of ideographic characters.

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