It is the letter J rendered as the Unicode character 🅹 (code point U+1F179), part of the Squared Filled styled alphabet. It is a single character you can copy and paste anywhere.
How do I type 🅹 on my phone or computer?
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 Filled J?
Anywhere text is accepted: Instagram bios, TikTok names, Discord, WhatsApp, gaming profiles and documents. The full Squared Filled alphabet is linked above.