The official emblem of individual officers or fire fighters; usually it gives the name of the department, the individual's rank, unit, or serial number, and frequently, the municipal or corporate seal
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}