a leader(a piece of material at the beginning or end of a reel or roll to allow the material to be threaded or fed onto something, as a reel of film onto a projector or a roll of paper onto a rotary printing press)
(typography,printing) a leader(a row of dots, periods, or hyphens, used in tables of contents, etc., to lead the eye across a space to the right word or number)
Daiei Toshokan ga shozō suru Amakusaban “Heike Monogatari”“Isoho Monogatari”“Kinkushū” wa, jūroku-seiki no Nihon o otozureta Kirisutokyō senkyōshi no Nihongo gakushū muke ni henshū sareta dokuhon (rīdā) desu.
The British Library’s Amakusa edition of ‘Feiqe no monogatari’ [Heike monogatari], ‘Esopo no fabulas’ [Isoho monogatari] and ‘Qincuxu’ [Kinkushū] is a reader compiled to help Christian missionaries, who came to Japan in the 16th century, learn Japanese.