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hashtagA symbol that provides a common topic identifier in text and chat messages so they can be searched as a group. Commonly used in tweets, the hashtag is a number sign (#) that is used as a prefix followed by text. Hashtags can be created and used to identify anything, including people, businesses, organizations, sports teams, political parties, hobbies, events, philosophies, moods, rants and raves. For example, the hashtag for the United States Marines is #marines. The athletically inclined might search for #triathlon or #ironman. See tag, Twitter and bashtagging.
|In this example at the Philadelphia airport, "hashtag worthy" means the trip is worth talking about.|