In mathematics, the **flatness** (symbol: **⏥**) of a surface is the degree to which it approximates a mathematical plane. The term is often generalized for higher-dimensional manifolds to describe the degree to which they approximate the Euclidean space of the same dimensionality. (See *curvature*.)^{[1]}

**Flatness** in homological algebra and algebraic geometry means, of an object in an abelian category, that is an exact functor. See flat module or, for more generality, flat morphism.^{[2]}

Preview | ⏥ | |
---|---|---|

Unicode name | FLATNESS | |

Encodings | decimal | hex |

Unicode | 9189 | U+23E5 |

UTF-8 | 226 143 165 | E2 8F A5 |

Numeric character reference | ⏥ |
⏥ |