Underscore

Also called low line or underbar.

How to type it

Right pinky with Shift.

Common uses

• Underscores stand in for spaces in file names, user names, and web addresses, where spaces are awkward or not allowed.
• On forms, a row of underscores marks a blank to be filled in.

Less common uses

• Programmers write multi-word names with underscores, as in snake_case.
• In Python, names with double underscores on each side, such as __init__, have special meaning.
• On a typewriter, the underscore was used to underline a word by backspacing and typing over it.