Answered By: Kyle Brady Last Updated: Aug 25, 2015 Views: 1373
Classmarks are used to organise books according to subject area. Libraries generally use classmarks to group items of a similar subject together, which in turn makes browsing the shelves easier.
Our classmarks are based on the Library of Congress Classification system. They consist of a mixture of letters, a whole number (the number before the point), and decimal numbers (all the numbers after the point).
A useful summary of LCC can be found here.