[unabst]

Ya, it should just read "slippery when wet". Maybe add an exclamation mark to show urgency and that you care.

So how we would describe the sign is usually what it should say. Like, "STOP".

[jacobr1]

Or in this case "Caution" which usually is the largest text on these type of signs. Caution and some indication they are referring to the floor, which could just be contextual. The queue that these signs are often short will natural indicate the eye to look at the floor, so that is nice when it works out.