What is the script engraved on the One Ring from the Lord of the Rings?

Answer 1

Its a type of Elvish. I think. It's in the language of Mordor. The Return of the King book has a guide to the forms of Elvish(and other things) in one of the appendixes. Yes, it is the Feanorian (elvish) script. However, the verse itself is in the Black Speech of Mordor. In the Common Speech it reads: One Ring to rule them all, One Ring to find them,

One Ring to bring them all and in the darkness bind them. This verse is a part of the full poem: Three Rings for the Elven-kings under the sky,

 Seven for the Dwarf-lords in their halls of stone,

Nine for Mortal Men doomed to die,

 One for the Dark Lord on his dark throne

In the Land of Mordor where the Shadows lie.

 One Ring to rule them all. One Ring to find them,

 One Ring to bring them all and in the darkness bind them

In the Land of Mordor where the Shadows lie.'