The Collaborative International Dictionary
Ecphoneme
Ecphoneme \Ec"pho*neme\, n. [See Ecphonema.]
A mark (!) used to indicate an exclamation.
--G. Brown.
[1913 Webster] ||
Wiktionary
ecphoneme
n. (context obsolete English) A symbol, !, comprising a vertical line and a dot below, signifying the end of a sentence that is an exclamation.