ハ

Freq.FrequencyTop 5,000

Meanings

third in iroha order; c; iii

Used as a sequence marker in the traditional iroha ordering system, equivalent to 'c' or 'iii' in Western contexts.

ド sense 2
ハ is the Japanese letter name for the note C used in key names like ハ長調, while ド is the solfège syllable used when singing or naming a pitch informally.

ヘ
ハ and ヘ are both single-character iroha labels with visually simple katakana shapes, and beginners can mix up which one marks the third versus the sixth item.
ホ
ホ marks the 5th position (note E) in the iroha/music ordering, whereas ハ marks the 3rd position (note C), so learners can confuse their order and pitch.
ニ
ハ marks the third item in the iroha ordering system, while ニ marks the fourth, so learners can mix up their sequence positions.

The katakana character ハ is derived from the kanji 八 (eight). Its use as a sequence marker comes from the iroha poem ordering.