あ in hiragana or ア in katakana (romanised a) is one of the Japanese kana that each represent one mora. あ is based on the sōsho style of kanji 安, and ア is from the radical of kanji 阿. In the modern Japanese system of alphabetical order, it is occupies the first position of the alphabet, before い. Additionally, it is the 36th letter in Iroha, after て, before さ. Its hiragana resembles the kana no combined with a cross. The Unicode for あ is U+3040, and the Unicode for ア is U+30A2.
The pronunciation is normally transcribed ; more precisely, it is or .