A trigram may also refer to Bagua, a philosophical concept in ancient China. It may also refer to a three-letter acronym.

Trigrams are a special case of the N-gram, where N is 3. They are often used in natural language processing for doing statistical analysis of texts.

Examples

The sentence "the quick red fox jumps over the lazy brown dog" has the following word level trigrams:

the quick red
quick red fox
red fox jumps
fox jumps over
jumps over the
over the lazy
lazy brown dog

And the word-level trigram "the quick red" has the following character-level trigrams (where an underscore "_" marks a space):

the  qui  k_r
he_  uic  _re
e_q  ick  red
_qu  ck_

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