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A triangle crossed out, forbidding bleach of any kind.
A crossed-out triangle forbids bleaching by any agent. The plain triangle permits it, and a triangle with two diagonal lines permits oxygen bleach but not chlorine.
In the ISO 3758 system a crossed-out triangle prohibits bleaching with any bleaching agent.
Contexts: Laundry
The three-way distinction — any bleach, oxygen only, none — is carried entirely by what is drawn inside or across the triangle.
Contexts: Laundry
A triangle standing on its base, crossed by a large diagonal cross covering the whole of its area.
Both are built from triangles, and both are used in laundry contexts.
Both are built from triangles, and both are used in laundry contexts.