Turkish alphabet uses the presence of one or two dots above a vowel to indicate that it is a front vowel. The Japanese kana syllabaries indicate voiced consonants with marks known as dakuten. The International Phonetic Alphabet (IPA) also has some featural elements, for example in the hooks and tails that are characteristic of implosives, , and retroflex consonants, . The IPA diacritics are also featural. The Fraser alphabet used for Lisu rotates the letters for the tenuis consonants ꓑ , ꓔ , ꓝ , ꓚ , and ꓗ 180° to indicate aspiration. See also Abugida Abjad Syllabary References Writing systems