The SI Brochure is the authoritative document describing the International System of Units (SI), the world’s only internationally agreed system of units. The new version introduces revisions to the section on non-SI units and updates the presentation of informative notes throughout the publication.
Source: https://www.bipm.org/en/-/2026-06-04-updated-si-brochure-clarifies-the-status-of-non-si-units
