The at sign (@).

Alternative form of att (Laos currency unit)

(Northern England, rare, possibly obsolete) Alternative form of 'at (relative pronoun; reduced form of "that" and/or "what")

(from the practice of targeting a message or reply to someone online by writing @name) (informal, neologism) Rare form of @; to reply to or talk to someone, either online or face-to-face.

In, near, or in the general vicinity of a particular place.

(indicating time) Indicating occurrence in an instant of time or a period of time relatively short in context or from the speaker's perspective.

In the direction of (often in a hostile or careless manner).

Denotes a price.

Occupied in (activity).

In a state of.

Indicates a position on a scale or in a series.

Because of.

Indicates a means, method, or manner.

Holding a given speed or rate.

(used for skills (including in activities) or areas of knowledge) On the subject of; regarding.

(Ireland, stressed pronunciation) Bothering, irritating, causing discomfort to

(also as at; before dates) (UK, Commonwealth, Ireland, especially finance) On a particular date.