... denoting the shell size (A=15 pin, B=25 pin, C=37 pin, D=50 pin, E=9 pin), followed by the actual number of ... video connections; this variant provided 10 regular (20) pins plus three coaxial contacts for the red, green, and blue video signals ... , and the one on the right is a 25-pin female (DB-25F) socket. The hexagonal pillars at either end of each ...