The Wikipedia page for Long-time nuclear waste warning messages describes the messages intended to communicate danger to future humans in the event of nuclear disaster. Since today's written languages are unlikely to survive several thousand years into the future, pictograms and hostile architecture are used.
In an unlikely application of the messages, Etsy artists have adapted them into items from T-shirts to cross-stitch patterns to wall hangings reading "In this house, we believe this is not a place of honor. No highly esteemed deed is commemorated here. Nothing is valued here…." and more.