Skum

Have you ever looked at a fire extinguisher in Denmark?

No? Can I say that I’m not surprised?

If you did you might be surprised to see that foam fire extinguishers don’t have the word foam on the sign above them

They have the word skum instead.

Scum in English is from the Middle Dutch word schum, which means foam.

Madeira’s part of Portugal, so here are some photographs of espuma.

English; the language with more words for the same thing than any other language, apart from words for love and snow. Probably.