A triangle with two diagonal lines inside or a triangle with CL inside and a cross-through indicates that you should use non-chlorine bleach. The circle is also important.

There are several unusual symbols hiding on your clothes labels and they're all quite important - the triangle most of all. ByAlex Evans, Deputy Audience Editor 19:04, Sat, Jun 7, 2025 | UPDATED ...

These symbols all relate to bleach usage. An empty triangle signifies that the item can be bleached. A triangle with a cross through it means don't bleach this item, reports the Express.