noun
fourth (in iroha order); d; iv
Used in the traditional iroha ordering system to denote the fourth item, equivalent to 'd' or 'iv' in Western sequences.
See also: いろは順
いろは順で「ニ」は四番目にあたる。
In the iroha order, 'ニ' corresponds to the fourth position.
noun
Used mainly in key names and chord notation in a Japanese musical context; equivalent to the note D.
この曲のキーはニ長調です。
The key of this piece is D major.