Printer's dagger

• Name of the "divided by" sign with a line and two dots
• Dagger, in printing
• + or –
• Dagger from old non-Arab country
• Manuscript symbol
• Top sailor knocked back his rum?

Wikipedia Word definitions in Wikipedia
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 . ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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.