footnote
A note at the bottom of a page in a book or document, providing additional information or citation.
In this paper, all important sources are listed in footnotes.
The footnote numbers don't match the main text.
Standard modern kanji form.
Rarely used kanji form; 註 is an older variant of 注.
Compound of 脚 (kyaku, 'foot, bottom') and 注 (chū, 'annotation, note'), literally 'footnote'. The kanji 註 is an older variant of 注.