What's LO?
A ligand orbital? Lorillard Inc. on the NYSE? Some new element that a bunch of scientists made 5 atoms of that lasted 0.2 microseconds? Well, in the world of VIPEr an LO is a learning object. Great...what's a learning object? Wikipedia defines a learning object as "a collection of content items, practice items, and assessment items that are combined based on a single learning objective".