The '/58' designates a specific sheet within the standard for 'CONTACTS, ELECTRICAL CONNECTOR, PIN, CRIMP REMOVABLE'. The '-360' specifies a size 22 pin contact with crimp termination, suitable for 28-22 AWG wire, and is gold plated. The '-25PK' indicates the packaging quantity, specifically a '25 Pack'. This prefix identifies a US aerospace/military hardware standard for electrical connector contacts, specifically MIL-DTL-39029 or SAE-AS39029.