𝐓𝐡𝐞 𝐪𝐮𝐢𝐜𝐤 𝐛𝐫𝐨𝐰𝐧 𝐟𝐨𝐱
Mathematical Bold replaces every Latin letter with its heavy-weight Unicode twin, keeping letter widths identical to normal text. Because the shapes are familiar, bold is the easiest fancy style to read in bios, usernames and chat.
Where it's used: Instagram and Telegram display names, emphasis inside plain-text posts, list headers.
Unicode block: Covers U+1D400–U+1D44F of the Mathematical Alphanumeric Symbols block; digits are left unchanged.