Theta dot symbol in word

In Microsoft Excel and Word, where do I find the over-dot symbol for rate, for example: Q-dot "over-dot" in Microsoft Word and Excel - Heat Transfer & Thermodynamics engineering - Eng-Tips theta rhythm, theta wave 1. A pattern of brain waves having a regular frequency of 4 to 7 cycles per second as recorded by an electroencephalograph, observed during various states of light sleep or arousal. In ancient times, Tau was used as a symbol for life or resurrection, whereas the eighth letter of the Greek alphabet, theta, was considered the symbol of death. According to Porphyry of Tyros, the Egyptians used an X within a circle as a symbol of the soul; having a value of nine, it was used as a symbol for Ennead. I want to be able to put the "^" over a "p"- a p with a hat, basically. In the insert symbols, the only ones with the hat are the French vowels. Does anyone know how I could do this? thanks