European chord symbols

[testpattern]

From time to time, especially on the French sites, I come across a chord symbol that I don't recognize, such asA-, Gº, B∆, or G0. Is A- a diminished? And what the heck is a B-delta? I'm assuming that these are just the French typographic conventions that describe chords that I know well enough, but I don't know how to read them. Thanks for your time!

[Thrip]

A-, Gº, B∆, or G0. Is A- a diminished? And what the heck is a B-delta?

In order: A minor, G diminished, B major 7, G diminished, B minor/major 7

[testpattern]

Thank you!