Do you know that first line that almost every script in Unix has, that starts with an '#!' ? That's what shebang is. I must admit that this is a new word for me. Although I have already used that line allot.
Here's some examples of shebangs:
The bash script:
The python script:
The perl script with argument to enable warnings:
You can find more info about etimology, history, etc. in the usual place.