1. A word or phrase preceded by the hash symbol (#) used on social media to identify messages on a specific topic or to increase visibility of a post
She used the hashtag #MondayMotivation to share her inspirational post.
Ela usou a hashtag #MondayMotivation para compartilhar seu post inspirador.
2. The hash symbol (#) itself when used in this context
Don't forget to add a hashtag to your tweet.
Não se esqueça de adicionar uma hashtag ao seu tweet.