「？」What are these brackets called in Japanese?

[Guambear]

Would like to try to study the style rules use seem kind of flexible.

[Rrwrex]

I believe they are called 鉤括弧:

https://en.wiktionary.org/wiki/鉤括弧

[Gorbit99]

Just quotation marks in English 「」『』 - Quotation Marks | Japanese with Anime