do you mean something like this?
http://www.lambayrules.ie/ccdata/images/full2_5_11.jpg
But Obviously the Outputs varying in size?
I know what you mean though,
You start with a Mic Input (Male End) And have a splitter with a Female Entry, So basically the mic input, the long end , plugging into a Female port, being the open end, like human production parts
So the Female Splitters outputs are; One being headphones, and one being Mic, Resulting in the original Mic Input ending in a double input, one for mic and one for headphones
Also you could get the reverse, A normal mic sized input in the end (the one that goes into the device you want to use it one) And THAT having two outputs, one being headphone and one being mic?
I think these are the more common ones
