Its really a DE-9F connector (on the computer, on the joystick it
would be DE-9M)
D = connector type
E = shell size
9 = connections
F = Female (could be S for socket but that is confusing as you could
have a male socket I guess?)
It could be called a DB-9 but that is not its real name, that came
about mostly due to serial ports, since they originally used a DB-25
connector, then later on they switched to a DE-9 everyone just started
calling them DB-9, but since the second letter is the physical size of
the plug, That is not correct, and can be an issue if your shopping
for one.