trainguy77 said:
The problem with that is many people will not know that means connect.
Well yes, if you look at most such symbols, that is the case. They are intended to be distinct and easy to remember, but they do need to be learned.
Take a look at the application you are mimicking, iTunes. What does a giant colorful eyeball mean, or that radiation symbol? How about the little CRT at the bottom with a snowflake on it? Or those two arrow pretzels on the bottom left? How about the little clover and apple on the keyboard? You learn them and move on.
One problem with the symbol you posted earlier is that it does have a pre-existing meaning, electrolytic capacitors are often drawn like that. I'd initially think it means "charge" for some kind of peripheral.
Back to schematics, a physical connection is usually shown by nested arrows, like so:
That might be a comfortable way to indicate that something is physically plugged in. I'd find it a little troubling for a virtual connection, though.