Why is period T in physics?

A period T is the time required for one complete cycle of vibration to pass a given point [1]. As the frequency of a wave increases, the period of the wave decreases. Frequency and Period are in reciprocal relationships and can be expressed mathematically as: Period equals the Total time divided by the Number of cycles.

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1. ↑Principles of Vibration, Oxford University Pres, 2001, 0-195-142462

   Tongue, Benson,, Oxford University Pres, 2001, ISBN

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I'm not a native English speaker and I was wondering, why 'the period' got the letter $T$. I've asked myself the question when I was thinking about stuff related to the frequency. I.e.:

• $f$ - frequency
• $v$ - velocity of a wave
• $a$ - acceleration

all of those have 'generic' markings, but not 'the period'. Was the letter $T$ used to somehow relate to 'time' the period describes? (I just need an acknowledgement really)