Write the name of the tab, the command group, and the icon you need to use to add a symbol or special character to a Word document. Tab:
Command group:
Icon:

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)

you may need to email for some tech support. : )