Kilroy
/ˈkɪlrɔɪ/- a mythical person, popularized by American servicemen in the Second World War, who left such inscriptions as 'Kilroy was here' on walls all over the world吉劳埃（二战时美国军人传说的神秘人物, 曾在世界各地的墙壁上留下“吉劳埃到此”等题词）。
词源
of the many unverifiable accounts of the source of the term, one claims that James J. Kilroy of Halifax, Massachusetts, a shipyard employee, wrote 'Kilroy was here' on sections of warships after inspection; the phrase is said to have been reproduced by shipyard workers who entered the armed services.