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An object is a thing.

Everything that can be talked about in mathematics and logic can be referred to as an object.

Also see


As an example, $3$ is the proper name for a particular object, in this case a number.

This particular number can also be identified by using, for example, the property: being the smallest positive odd prime number.

Also known as

‎Lewis Carroll (Charles Lutwidge Dodgson), one of the first to consider such a basic abstraction, used the word thing.

Another word used in this context is entity.