 The script is written from left to right.The script encodes three vowels, "a", "i", "u", and twenty-two consonants, "k", "x", "g", "c", "ç", "j", "t", "θ", "d", "p", "f", "b", "n", "m", "y", "v", "r", "l", "s", "z", "š", and "h".Old Persian contains two sets of consonants