# no-hair theorem

> English word · Noun

## Definitions
1. A theorem postulating that all black hole solutions of the Einstein-Maxwell equations in general relativity can be completely characterized by only three externally observable classical parameters: mass, electric charge, and angular momentum.

## Etymology
Hair is a metaphor for the unnecessary information beyond the three proposed parameters.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/no-hair-theorem