industrial union; single-industry union
Refers to a labor union organized by industry rather than by company or craft. Common in Japanese labor terminology.
Japanese labor unions include enterprise-based unions and industrial unions.
彼は単産の役員として活動している。
He is active as an officer of an industrial union.
労働組合 is the general term for any labor union, whereas 単産 specifically denotes an industry-wide union federation.
Abbreviation of 単一産業別労働組合 (tan'itsu sangyōbetsu rōdō kumiai, 'single-industry labor union').