我从我另外一个答案里直接贴过来
我过去的地方德国、奥地利、意大利、荷兰、捷克等，在公众设施用WC作为厕所的标志的非常常见（法国没见过WC，多数地方是toilettes，意大利多数地方是 WC，但见过少数地方用Toilette），不知道哪儿来的国外很少用，英语国家很少而已吧。wiki不知道你看了英文wikipedia这段没，上面说 ——
WC The WC refers to the initial letters of
, which, despite being an English language abbreviation, is not in common use in English-speaking countries – but is widely used internationally: in France (pronounced "le vay-say" or "le vater"), in Italy (pronounced "vi-ci" or "vater"), Romania (pronounced "veh-cheu"), the Netherlands (pronounced "waysay"), Germany, Switzerland and Hungary (pronounced "ve-tse"), Denmark (pronounced "ve-se"), Norway (pronounced "vay-say"), Poland (pronounced "vu-tse"), Spain (pronounced "uve-cé" or "váter"), and others.
这里就说英语国家少用，但广泛用于国际上其他国家
