Section 31(10) in The Delhi Police (Appointment & Recruitment) Rules, 1980
(10)An armlet or brassed with the letter "S.P.O." and a Serial.number should be issued to Special Police Officers, Senior Special Police Officers, shall, in addition, be given an embroidered badge displaying Delhi Police Emblem with an inscript, 'Special Police Officer', below, to be fixed on the top left pocket of their shirts/coats.
