Charles Ellson writes:
A random cyber-stroll around Europe suggests it might be more
universally understood than signing in FR/IT/DE (or Latin). ISTR my
French teacher warning that asking for the toilet in FR will often get
you directed to a bathroom with only washing facilities.
And do not then do as one friend of mine did when arriving in France on
an exchange visit and mistake the bidet for the toilet (having heard of
'strange' French toilets). Luckily she only needed to urinate