# Why is 'the period' marked as letter T?

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)

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I agree with you conclusion about $t$ and time, but I'll let native English speaker to confirm it as an answer. –  Pygmalion May 14 '12 at 16:34
I think so - it seems nicely symmetric since in many equations you would write something like $x=\sin(\frac{t}{T})$ - the time variable t increases until it gets to big T, then things repeat. –  user2963 May 14 '12 at 16:50