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The Collaborative International Dictionary
Obelus

Obelus \Ob"e*lus\, n.; pl. Obeli. [L., fr. Gr. 'obelo`s, prop., a spit.] (Print.) A mark [thus
---, or /]; -- so called as resembling a needle. In old MSS. or editions of the classics, it marks suspected passages or readings.

Wiktionary
obelus

n. 1 A mark ('''÷''') used to represent division in mathematics. Also used to indicate a written or printed passage, and in ancient manuscripts to mark a word or passage as spurious or doubtful. 2 A dagger mark ('''†''') used as a reference mark in printed matter, or to indicate that a person is deceased, often used to indicate a footnote.

Wikipedia
Obelus

An obelus (symbol: ÷, plural: obeluses or obeli) is a symbol consisting of a short horizontal line with a dot above and below. It is mainly used to represent the mathematical operation of division. It is therefore commonly called the division sign. Division may also be indicated by a horizontal line ( fraction bar), or a slash.

Historically, this symbol had also been used to represent subtraction in Northern Europe.

Obelus (gastropod)

Obelus is a European genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Hygromiidae, the hairy snails and their allies.