Keyword pulse?

I'm working on a sketch and typed "pulse" and was about to continue type something else to make a new function, but "pulse" turned orange, meaning it's some kind of keyword. Googleing the word I get overloaded with stuff, mostly about pulseIn().

I tried the language reference here:

and it too only found pulseIn().

Where can I find out what "pulse" means to Arduino? It might do what i am trying to do and therefore I can use it rather than reinvent the wheel.

I also tried F1 while the word was selected.

What gets colored orange is based on text in keywords.txt for each library. Search through the keywords.txt files on your computer (in Arduino related directories) to see which one lists pulse.

What do you expect to find that pulse does? It probably doesn't.