Iroha

The Iroha (いろは^?) is a Japanese poem, probably written in the Heian era (794–1179). Originally the poem was attributed to the founder of the Shingon Esoteric sect of Buddhism in Japan, Kūkai, but more modern research has found the date of composition to be later in the Heian Period. The first record of its existence dates from 1079. It is famous because it is simultaneously a perfect pangram and isogram, containing each character of the Japanese syllabary exactly once. Because of this, it is also used as an ordering for the syllabary, in the same way as the A, B, C, D... sequence of the Latin alphabet.

The first appearance of the Iroha, in Konkōmyōsaishōōkyō Ongi (金光明最勝王経音義^?), ('Readings of Golden Light Sutra') was in seven lines: six with seven morae each, and one with five. It was also written in man'yōgana.

以呂波耳本部止
千利奴流乎和加
餘多連曽津祢那
良牟有為能於久
耶万計不己衣天
阿佐伎喩女美之
恵比毛勢須

Structurally, however, the poem follows the standard 7–5 pattern of Japanese poetry (with one hypometric line), and in modern times it is generally written that way, in contexts where line breaks are used. The text of the poem in hiragana (with archaic ゐ and ゑ but without voiced consonant marks) is:

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