How to type symbols, accents, special characters, and weird punctuation

How to type Infinity symbol ∞

On Windows:
Hold down the ALT key and type 8734 on the keypad
Note: alt code greater than 255 are not universal and will only work in applications that support them such as Wordpad or Words

On Mac OS:
Hold down the Option key and press 5

∞ or ∞

More symbols in the category: How to type math symbols | How To