/23 refers to a detail specification sheet for connectors with socket contacts and printed wiring board termination types. The dash number -7 specifies connector options, including a 9-contact receptacle with solder termination and a DE shell size. The suffix 'F' indicates the finish of the connector. For this specific part, the contacts are gold plated, and the shell is steel, cadmium plated. M24308 (MIL-DTL-24308) is a United States military standard for non-environmental, polarized shell, miniature, rack and panel D-subminiature electrical connectors.