Definitions

1. noun

A symbol, especially the hash (#) or octothorpe, used to separate telephone company identification codes on telephone keypads.

“The octothorp on the phone keypad indicates the end of a company’s identification code.”

2. noun

A hashtag or an octothorpe (#) used to categorize or label content on social media or the internet.

“She used an octothorp to label her post as a humorous meme.”

3. noun

The hash (#) symbol, especially in computing and telecommunications.

“The error message included an octothorp to indicate the location of the problem.”

4. verb

To categorize or label something with a hashtag or an octothorpe, especially on social media or the internet.

“She octothorped her tweet with a popular hashtag.”