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.

Letters inside squares — retro computing style

Squared puts letters inside squares (🄰-🅉) — a retro computing look popular in gaming tags and aesthetic headers.

🅈🄾🅄🅁 🅃🄴🅇🅃 🄷🄴🅁🄴