The Standard Model is based on a principle called "gauge symmetry". According to this principle, every particle has a direction in an internal space, much like the needle in a compass, except that the needle doesn't point anywhere you can look.

— Sabine Hossenfelder Lost in Math: How Beauty Leads Physics Astray (2018)

Notes from Wikiquote

Lost in Math, Chapter 3, Section The Standard Model. Page 51, 2018 hardcover ed. ISBN: 978046094257

Lost in Math: How Beauty Leads Physics Astray (2018)

Lost in Math: How Beauty Leads Physics Astray (2018)

Lost in Math: How Beauty Leads Physics Astray (2018)

Quote text and notes from Wikiquote: Sabine Hossenfelder (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.