# Planck unit

> English word · Noun

## Definitions
1. Any one of several natural units in a system originally proposed by Max Planck based on universal constants. Symbols for Planck units are the symbol for the physical quantity with a subscript P.

## Etymology
Named after Max Planck (1858-1947), German physicist.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/planck-unit