because B means 25 pins (see illustration below). Two DB-15 connectors are widely used. The larger, two-row female DA-15 is the game port on a PC, and the smaller, three-row, female high-density ...

This connector is in the same family as the familiar DB-25 parallel port, DE-9 serial port and the old DA-15 joystick port, but there’s something very special about the DB-19 connector ...