STTK

Etymology
The initialism comes from late Suomen Teknisten Toimihenkilöjärjestöjen Keskusliitto ("The Finnish Confederation of Technical personnel" - unofficial translation), one of the predecessors of current STTK.

Proper noun

 * 1) the Toimihenkilökeskusjärjestö STTK, in English "Finnish Confederation of Salaried Employees", abbreviated also in English as "STTK", a central organization of trade unions representing white-collar employees on operative level in both public and private sector