Division Symbol in Math
Puzzle 20 of Women Inventors Hard Pack
Question is: Division Symbol in Math
and the answer is: OBELUS
Word Meaning:
OBELUS — (historical) A symbol resembling a horizontal line (–), sometimes together with one or two dots (for example, ⨪ or ÷), which was used in ancient manuscripts and texts to mark a word or passage as doubtful or spurious, or redundant; an obelisk.
Definitions from Wiktionary.