Answer: obelus

AnswerCrossword Clue
OBELUSCritical mark.
OBELUSReference mark, as a dagger.
OBELUSDagger, in printing.
OBELUSManuscript symbol
OBELUSDagger, in printing
OBELUS+ or -
OBELUSPrinter's dagger
obelusa symbol - or ΒΈ used in ancient manuscripts to mark a questionable passage
obelusa symbol used in ancient manuscripts