The mathematical symbol for period is
O A. A
O B. v
OC. T
O D. f

C. T

Explanation:

Period is a unit of time; and in the context of waves or oscillations it is defined as "the time elapsed between two equivalent points on the wave or oscillation".

It is important to note Period (denoted by ) is one of the most important factors (along with the amplitude, frequency and velocity) to describe and characterize a wave.

In addition, Period has an inverse relation with the frequency , this means that if we are given the frequency of a wave, we can inmediatly know its Period.