Definition of Obelus:

part of speech: noun

In anc. Mss., the mark (-) or (÷) inserted, particularly in those of the septuagint, to indicate that the passage so marked is not found in the Hebrew; the line thus (-) in modern writing is employed to mark the place of a break in the sense where it is suspended, or when some awkward grammatical transition is made, but is often used instead of a(;) or(:).