What does the Oman flag look like?

Answer 1

It's green with Arabic calligraphy on it that is Muslim and says:

"La ellah ela Allah Muhammad Rsol Allah" which in English means:

"There is no God but Allah and Muhammad is the Prophet/Messanger of Allah".

With a sword below it.

Answer 2

Here's a pictures. There are many sites which list furthur information. Try a search engine with an image search:

Answer 3

It has a green,white and red colors and on the upper left of it is a small white drawing.