CPO stands for Central Police Organisation in SSC exams. The SSC CPO exam recruits Sub-Inspectors in the Delhi Police and CAPFs like CRPF, BSF, CISF, ITBP and SSB, and Assistant Sub-Inspectors in CISF. It is separate from SSC CGL, CHSL and GD Constable exams. The selection includes a written exam, PET/PST, and a detailed medical examination.