Where can I find a complete list of variables start with "^"?

Hi, I'am a novice of NSIS. I saw that many sample scripts using variables start with "^" such as "^Name", "^UninstallLink". But I don't find explainations for such variables in the document of NSIS. Can anyone give me a hint on this?

Check out the language files

But ^UnistallLink is not in the language files. Where does it come from?

only examples i could find looked like, LangString ^UninstallLink ${LANG_ENGLISH} "Uninstall $(^Name)"

so they are custom langstrings, why they prefix with ^, I don't know

Where did you read about it?