"DB" Type Connector
DB9F Connector
DB9F (Female) Connector:
Nine (9) small sockets arranged in two rows (One row of 5, the other 4).
Two small screws for secure attachment to complementary plug on host computer
The outer shell of the metal shroud at the front of the DB9F is slightly tapered on each end. The size of the shell is approximately 5/8 inch wide (at the widest point of the taper) x 5/16 inch high.
 
Common usage in "PC" type computers:
RS232 serial devices (serial mouse, external modem, serial pole display, "intelligent" cash drawers, mag stripe reader with RS232 interface).
The "PC" standard for RS232 serial devices uses the DB9F connector attached to the cable; the DB9M (male) mating connector is part of the computer.