I also stumbled upon this Wikipedia article while researching some historical usage of symbols. "International variation in quotation marks":
https://en.wikipedia.org/wiki/Intern...uotation_marks
It might be helpful on catching some even more odd variations of quotation marks that wasn't discussed previously.
Seems to me like there is every single variation under the sun. Left/Left, Left/Right, Right/Left, Right/Right, RightDown/LeftUp, LeftDown/RightUp, etc. etc.