This picuture tell you what is Receptacle Pin

Here are some characteristics of receptacle pins:

  1. Purpose: They are used to create a secure connection point within a circuit or between multiple circuits or devices.
  2. Appearance: Receptacle pins are usually cylindrical with a hole running through their center, designed to align with the solid male pins.
  3. Material: Often made from conductive materials such as copper or brass, with a gold or nickel plating to ensure good electrical conductivity and to protect against corrosion.
  4. Usage: Commonly found in various types of connectors, including headers, sockets, and expansion slots.
  5. Pitch: The distance between the centers of two adjacent receptacle pins is known as the pitch, which can vary based on the application.
  6. Mounting: They can be mounted on Printed Circuit Boards (PCBs) and are used for through-hole technology as well as surface-mount technology (SMT).
  7. Applications: Found in a wide range of electronic devices, from computers and servers to consumer electronics and industrial equipment.