Remote references are references (pointers name) located in your remote repositories. ie
You can get a full list of remote references explicitly with:
git ls-remote
git ls-remote [remote]
From https://github.com/....
db393705d7bb3b8a1c155976082c6ee5691e678e HEAD
db393705d7bb3b8a1c155976082c6ee5691e678e refs/heads/main