What is the full fom of MOHD this word? We should use this word or not if we should not use this word why?

The words of Rasuulullaah -sAaws- were precise and meaningfull, such as did not leave any doubt. His Name is MuHammad Ibn Abdullaah Ibn Abdul-Muttalib, or Ahmad, or Abu Al-Qaasim, or Al-Mustafa, or Nabi, or `Abdullaahi wa Rasuuluhu.. . And we should say Soll-Allaahu `aleihi wa sallam, or the like, when we mention him. We shouldn`t use this kind of unclear expression especially in matters of The Religion, and it`s in the rules of the help desk also, if you read them. So please don`t. And when there is misunderstanding, ask to clarify.