I was reading comics at work and I saw this ad for Groupon. It caught my eye because it’s an excellent example of how Irons work:
From left to right: 3 or 4 Iron, 5 Iron, 6 Iron, 7 Iron, 8 Iron, 9 Iron, Pitching Wedge, Gap Wedge, and Sand Wedge. I can’t be sure if the curved back iron on the far left is a 3 or 4. The clubface looks like the angle on a 4 Iron but it has a curved back so may be something else. Note the different spoon angle on the Sand Wedge. The foot of the club is canted slightly upward, giving the club extra bounce to scoop the ball out of the sand. Sand Wedges can also be used for very short chip shots because of this extra bounce (but really, that’s what the Gap Wedge is for – I don’t have a gap wedge so I use the Pitching Wedge, 7-iron at an extreme angle, or in very rare cases, the Sand Wedge for chip shots).