obelus

noun, plural ob·e·li [ob–uh-lahy] /ˈɒb əˌlaɪ/.

1. a mark (− or ÷) used in ancient manuscripts to point out spurious, corrupt, doubtful, or superfluous words or passages.

noun plural -li (-ˌlaɪ)

1. a mark (— or ÷) used in editions of ancient documents to indicate spurious words or passages
2. another name for dagger (def. 2)