noun
back issue; back number
Refers to a previous issue of a magazine, journal, or other periodical.
この雑誌のバックナンバーはどこで買えますか。
Where can I buy back issues of this magazine?
noun
uniform number; shirt number
Sports term for the number on the back of a player's uniform. Often replaced by 背番号 in Japanese.
See also: 背番号
彼のバックナンバーは10番だ。
His shirt number is 10.