You do not type it from a keyboard; you copy it. Press the copy button above and paste it into any app. That is the whole point of Unicode styled letters.
Where can I use the Squared G?
Anywhere text is accepted: Instagram bios, TikTok names, Discord, WhatsApp, gaming profiles and documents. The full Squared alphabet is linked above.
What is the Squared letter G?
It is the letter G rendered as the Unicode character 🄶 (code point U+1F136), part of the Squared styled alphabet. It is a single character you can copy and paste anywhere.