High Valyrian is a fictional language created by David J. Peterson
which used in the Game of Thrones television series, and based on the
few words of High Valyrian used in George R. R. Martin's series of fantasy novels, A Song of Ice and Fire.
High Valyrian can be written with the Latin alphabet, but is not
written in the television series. This is a method of writing
High Valyrian devised by Tsikhi using Tolkien's Tengwar script
and known as Valyrio Tengvar.
The tehtar are written over (or below in the case of diphthongs), the consonant which they follow. If vowels appear on their own or at the beginning of a word, the tehtar are written over the vowel carrier.
Rómen is used when followed by a vowel, and Óre is used when followed by a consonant.