signum

noun

A sign, mark, or symbol. / (history) A medieval tower bell used particularly for ringing the 8 canonical hours.

The signum on the door indicated that the store was closed.

意味（1）

A sign, mark, or symbol.

意味（2）

(history) A medieval tower bell used particularly for ringing the 8 canonical hours.

意味（3）

(mathematics) A function that extracts the sign of a real number x, yielding -1 if x is negative, +1 if x is positive, or 0 if x is zero.