Where does this style work?

It works wherever plain text is accepted — bios, usernames and comments — because the letters are real Unicode characters, not a font.

Can I copy it together with other words?

Yes — copy the whole output and paste it next to plain text; every letter stands alone.

White-on-black squared letters

Negative squared puts letters in white-on-black boxes (🅰-🅹) — high-contrast tags for gaming and streetwear bios.

🆈our text here