....and all "definitions" and station "identifiers".
Like "Which is the odd one out?"
a) Ground,
b) Tower,
c) Approach,
d) Radar.
"What is the meaning of the word 'Over'"
a) I am overhead,
b) I've finished speaking, you may respond,
c) I have more to say in a moment,
d) Did you understand what I said?
and by way of confirmation from what HWD said...
VDF, Radio Failure, Pan and Mayday procedures