hashtag

/ˈhæʃˌtæg /

Other forms: hashtags; hashtagged; hashtagging

A hashtag is a keyword or phrase that's used on social media. By searching for a certain hashtag, you can easily find the cute cat content you're looking for.

To create a hashtag, type # (which is variously called the "number sign," "pound sign," or "hash") followed by a word. You might post about a successful pie-baking experiment and use the hashtags #pie, #sourcherrypie, and #baking. And if you're looking for content about capybaras, just click on #capybara and you'll see a list of every photo or post with that hashtag. The very first hashtags appeared on Twitter in 2007, and they quickly spread across all social media.

Definitions of hashtag

1. noun

   the (#) symbol
   synonyms: octothorpe, pound sign
2. noun

   word or words introduced by the symbol (#) on social media to call attention to a specific person, topic, etc.
3. verb

   introduce a word or phrase by the symbol (#) on social media to call attention to a specific person, topic, etc.