This is a picture of a note or paper with two lines (the one on top being twice as long as the one on bottom). It has a grid of sorts between the lines, in the middle of the paper. It seems to show a report or graph.
An invoice icon. Works for a receipt an similar stuff too.
Idea of Invoice Icon by Anonymous
We've received the idea on April 23, 2012 and created the icons on May 09, 2012