1. The symbol (#), used in typography and computing; also called a hash mark or pound sign.
Usage: Common in digital communication and programming contexts; Also used to denote numbers in some contexts

Examples

• Press the octothorpe key on your phone to complete the call.
• On social media, users add an octothorpe before a word to create a hashtag.
• The octothorpe symbol appears on every telephone keypad.
• In programming, the octothorpe is often used to denote comments.
• The document was labeled with an octothorpe followed by the file number.