Glossary · term

Sigma

Measurement

Aliases
standard deviation, 5σ
Domain
Measurement

Definition

One standard deviation; a result's distance from the null in those units. Particle physics claims a discovery at 5σ; the Hubble tension has reached it.

Open on the Glossary shelf — the interactive card, the filters, and everything alongside it.

From the Glossary database in Notion, last edited 2026-08-17. This page is the row, rendered by the build; nothing on it is written by hand.