U+ Format: Standard Unicode notation (e.g., U+0041)
Hexadecimal: Base-16 representation with 0x prefix (e.g., 0x0041)
Decimal: Base-10 representation (e.g., 65)
JavaScript: Escape sequences for JS strings (e.g., \\u0041)
HTML Entities: HTML character references (e.g., A or A)