Know what has been checked.
A useful safety reference distinguishes a symbol's identity, an explanation of its meaning, and the rules for using it in a particular workplace.
Primary references first
ISO symbol pages link to the ISO Online Browsing Platform. Chemical pictogram notes cite UN GHS and OSHA material with the jurisdiction made explicit. NFPA pages point to the publisher and the joint OSHA/NFPA explanation of the labeling systems. A standards identifier is not proof that a particular installation complies.
Artwork and attribution
Local artwork is paired with its Wikimedia Commons file page, creator credit, license label, and license link when supplied by that source. Metadata for all published files was retrieved from the Commons API on 2 October 2026. This confirms that the source and its metadata resolved on that date; it is not a claim of pixel-for-pixel equality with the latest source revision or certification by a standards body.
SVG downloads preserve the local reference file. PNG downloads are proportional raster conversions on a 1024-pixel white canvas. Downloadable attribution files identify the source, creator, license, and conversion. The linked source file's history and terms should be checked before reuse.
Explanatory content
Short meanings describe the message of the sign. Application notes are published separately when they have explicit public-source citations. Older extended meanings, industrial-use examples, and long-form articles without claim-level review are retained in the project for editorial work. They are excluded from the published reference pages, search data, and interactive tools.
What our dates mean
- Record date: the date recorded in the directory metadata. It does not certify a full review of every statement or a standards edition.
- Source metadata checked: the date the artwork source's metadata was retrieved.
- Application notes checked: the date the linked public sources were checked for those specific notes. This is not a professional sign-off.
Automated publication checks
The build checks local artwork, source and license fields, dates, related links, reference content, generated pages, downloads, metadata, and sitemap membership. Tests cover search behavior and interactive tools. Automated checks detect technical defects; they cannot establish safe installation or legal compliance.
Colors, sizes, and jurisdiction
Screen hex colors are digital references, not manufacturing tolerances. Download pixel dimensions are not physical sign-size requirements. This site does not publish a universal size-to-distance formula. Standards editions and legal adoption vary; follow the applicable rule and site-specific assessment.
Corrections
Use the correction link on a symbol page to identify the reference and provide supporting evidence. Material corrections should be tied to their source and reflected in the relevant record or note. Contact details.