# Compact

Several specialized usages of the terms**compact**and

**compactness**exist.

- Multiple definitions of the term "compact" are found in mathematics:
- The most common usage relates to topology, where one considers
**compact spaces**. This article also includes the closely related notion of a**compact set**. - In order theory and domain theory the different (though not entirely unrelated) notion of a
**compact element**is typically used.

- The most common usage relates to topology, where one considers
- A
**Compact Flash**is a type of data storage device. -
**Compact car**is an automobile size class in the American market.

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