eroteme (?)
Definition - An obsolete name for the question mark symbol.

Etymology -
The term derives from the Greek erotema, to question.

Oxford English Dictionary -
There is no OED citation for this term.

Quotation -
"The value of the eroteme as a sign of pause, is stated very differently by different grammarians.... J.S. Hart avers, that, 'A question is reckoned as equal to a complete sentence, and the mark of interrogation as equal to a period.'"
(Source: 1858, Goold Brown, The Grammar of English Grammars, fourth edition, Samuel S. and William Wood, page 798)

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