CEU stands for Continuing Education Unit.
These CEU credits are provided through the International Association for Continuing Education and Training (IACET). A CEU is a unit of credit equal to ten hours of participation in an accredited program designed for professionals with certificates or licenses to practice various professions. Doctors, nurses, lawyers, engineers, CPAs and other such professionals are required to participate in continuing education programs for a certain number of hours every year in order to keep their certificates, or licenses to practice, current.
The annual number of CEUs required varies by state and profession.