obelus

The word "obelus" is also an alternate name for the dagger  symbol. An obelus (pl. "obeli") is a symbol consisting of a line with dots above and below, , used to represent the mathematical division operation. This symbol is also known as a division sign. Originally this sign (or a plain line) was used in ancient manuscripts to mark passages which were suspected of being corrupted or spurious. The word "obelus" comes from the Greek word for a sharpened stick, spit, or pointed pillar. This is the same root as that of the word "obelisk".
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(n.)
A mark [thus /, or Ö ]; -- so called as resembling a needle. In old MSS. or editions of the classics, it marks suspected passages or readings.
  

N M
obelus| critical mark (spit-shaped put by suspected passages); obelisk; pivot

obelus /'ɔbiləs/
danh từ, số nhiều obeli ((cũng) obelisk) dấu ôben (ghi vào các bản thảo xưa để chỉ một từ hay một đoạn còn nghi ngờ) dấu ghi chú ôben (ghi ở lề)
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OBELO. OBELISCO