The distinctive emblem for cultural property to mark "movable or immovable property of great importance to the cultural heritage of every people" during an armed conflict, as defined in the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict (May 14, 1954).
Own work based on:

Rozporządzenie Ministra Kultury z dnia 9 lutego 2004 r. (Dz.U. 2004 nr 30 poz. 259)
Jan Zachwatowicz (Poland)