No disrespect implied here. This is just a question that's been hanging in my head for some time now.
Where did the "Peace Be Upon Him" part come from? This is definitely me, but at times I think that the phrase is Muhammad's last name or something like that. (Which of course isn't that at all; it was just me struggling with the way my brain is wired. But for the grace of God/Allah/Yahweh/and so on go I.)
It's kind of like rest in peace but in a more greater way since he was concider as the perfect person and Prophet as well in the Islam who didn't made a single mistake in life and tried to let people be on the right path in the name of Allah (God), hope you understand it now, kinda hard to explain you know.