While the definitions of jacks, plugs, and receptacles are well-standardized within the industry, the gender definitions for DC power connectors are less so. Many engineers simply follow the gender conventions of the RF connector industry, which defines a barrel connector’s gender based on the center pin configuration. Therefore, DC power connectors with a center pin are usually defined as male connectors and the mating connector as female. This defining line can sometimes get confused when addressing the difference between male and female jacks and plugs, but Figure 2 provides examples to help clarify.