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Related to at sign: hashtag
The symbol (@) for the word at, used for example in email addresses to separate the username from the domain name and in social networking platforms before a username to direct a message or comment toward that user.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n (Comput) → at-Zeichen nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007