At

• A preposition of the English language; signifying coincidence, or direction. See at (preposition)[?].
• In chemistry, the chemical symbol for astatine; the chemical element with atomic number 85 in the periodic table.
• The Top-level domain identifier of Austria.
• the punctuation symbol "@", known also as the commercial at, now principally used in e-mail addresses.
• A command used on Unix and Unix-like systems to schedule tasks to be performed at a later date.

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