Beef cut: Chuck (not by me of course)
Steak type: Flat iron steak
(also known as: top blade roast, shoulder top blade roast, top boneless chuck, petite steak,
butler steak, lifter steak, book steak, chuck clod, lifter roast, and triangle roast)
http://bbq.about.com/od/steaks/a/aa051207a.htm
The Flat Iron Steak (also know as a Top Blade Steak), now appearing in grocery stores and on restaurant menus was developed by teams at the University of Nebraska and the University of Florida. The problem presented to these researchers was what to do with a waste cut of beef from the shoulder of the cow. Though a flavorful and relatively tender cut of meat, the top blade roast has a serious flaw in the middle of it; an impossibly tough piece of connective tissue running through the middle.
So, after developing a method for cutting and presenting this steak, these friendly scientists have offered to us an amazing cut of beef. More than that, they have developed a nearly perfect steak for the grill. The Flat Iron (supposedly named because it looks like an old fashioned metal flat iron) is uniform in thickness and rectangular in shape. The only variation is the cut into the middle of the steak where the connective tissues have been removed.