What's the noun for obeliscs? Here's the word you're looking for.
obelus
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.
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.