Hehehe....gotta love the Henry System!
The Henry system is a way of classifying and sorting fingerprints based on which, if any, fingers contain whorls. It's slightly out of date, at least in the USA, because of AFIS. However, we had to learn it because some agencies, particularly the FBI, still test you on it when you apply for jobs.
The cool thing is, once you know the classification system inside and out, you can just glance at a ten card or a suspect's hands in the field, and know whether they might match a ten card that you have on file. It's a good way to eliminate suspects quickly. The downside is that you have to have all ten prints to really do it.
Oh yeah, that and it's a royal pain in the butt to learn! :devil: