I once worked for a company who had as a client a major Americain oil company. This oil company knows all there is to know about flying, and has produced a lengthy tome describing exactly how its air operations are to be carried out. It calls this book the Air Operations Guide. They abbreviate the title, and on the front cover, it says - AOG. It was confusing, to say the least, whenever AOG was mentioned.
The book is rubbish.