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It is unknown what the variable T is, but it is a mathematical notation that a dot over a variable stands for the derivative with respect to time of that variable. So

T with a dot over it = derivative of T with respect to time = dT/dt.

T in physics typically stands for the period/ 1/frequency

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The symbol you describe written on a medical prescription means one. Two dots over a bar with two down strokes (looks like a little symbol for pi) means two, etc.

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12y ago

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Q: What is the meaning of a T with a dot over it?
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