Heterogram [Noun.]

A heterogram is a word, phrase, or sentence in which no letter of the alphabet occurs more than once.

An isogram, on the other hand, in which all letters occur an equal number of times, is the same as a heterogram when each letter occurs once.

A heterogram may be distinguished from a pangram, which uses all of the letters of the alphabet (possibly more than once). A perfect heterogram is, however, the same as a perfect pangram, since both consist of all letters of the alphabet with each represented exactly once.

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