Also called "DB connectors" and "D-subs," they come in 9, 15, 25, 37 and 50 pin varieties. The D-sub designation defines the physical structure of the connector, not the purpose of each line.

Anyone know where I could find, free preferrably, stencils for common connectors like 9 and 25 pin D-sub connectors? Looking in Visio's stock EE stencil library I can find generic D-Sub connectors ...