Most of these abbreviations are fairly intuitive. If you see one you don't understand, just ask. I initially was going to build a glossary of shorthand, but most of the shorthand is obvious with a little thought or context. Immersion is the best way to pick it up. There is one bit of shorthand that is not immediately obvious.
Most people respond with the map grid.
I believe we should standardize our responses within the Squadron. It is rare to see someone give an altitude as part of their response, but altitude is often a major factor in how long it will take someone to get to you. The same holds true for heading. If someone is being chased several Huns and wants help it helps if they are not running away from the help, too. Because most of our keyboards have a numeric keypad a system of notation has developed that divides each map sector square into 9 smaller squares.