My understanding is that "Kebab" as such simply means "meat". In continental Europe, "Kebab" is often short for "Döner Kebab" (meat sliced off a central rotating skewer in thin shavings), while in the US, it seems to usually stand for "Shish Kebab", (skewers of meat cubes served on a plate either with or without the skewers).

Thank you very much. From what I'm used to, kebab would be a doner kebab in a wrap/sandwich. There are very few places doing that in London.

https://en.wikipedia.org/wiki/Doner_kebab