# Lah number

> English word · Noun

## Definitions
1. Any of a class of coefficients expressing rising factorials in terms of falling factorials.

## Etymology
Discovered by Ivo Lah in 1954.

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