Looks like that article is a general one on two- and three-character sequences. In C, "trigraph" specifically refers to nine special sequences beginning with "

Looks like that article is a general one on two- and three-character sequences. In C, "trigraph" specifically refers to nine special sequences beginning with "??": https://en.wikipedia.org/wiki/Digraphs_and_trigraphs#C https://en.wikipedia.org/wiki/Digraphs_and_trigraphs#C They were used to provide an alternate way of typing punctuation characters for keyboards that don't have them (e.g. "??(" is "[").