CirthCirth - Of course, the Noldor and Sindar were separated by an entire continent (initially) and the Sindar developed their own writing system.  It became known as Cirth.  However, ironically, when the Dwarves and Sindar began interacting, it was the Dwarves who fell in love with the Sindar script and adopted it as their own.  Later, when the Sindar were reunited with the Noldor, they recognized the beauty of Tengwar and began using it, and Cirth was almost completely abandoned by the Elves.  Although the Sindar spoke a distinct language (Sindarin) from the Noldor.

 

"Daeron the Minstrel, chief loremaster of the Kingdom of Thingol, devised his Runes; and the Naugrim (Dwarves) that came to Thingol learned them, and were well pleased with the device, esteeming Daeron's skill higher than did the Sindar, his own people.  By the Naugrim the Cirth were taken east over the mountains and passed into the knowledge of many peoples; but they were little used by the Sindar for the keeping of records, until the days of the War..." ~The Silmarillion, chap. 10 (Of the Sindar)