What were the words on the Prophet's ﷺ signet ring? (Common error).

asalamualaykum. why did the people who made the ring spell it upside down in the first place. and what about the isis flag was this the flag of our prophet

ٱلسلام عليكم ورحمة ٱلله وبركاته
could we get a library tour? also what is that book on the top shelf?

صل الله عليه وآله وصحبه وسلم تسليما كثيرا