That stands for Osher Lifelong Learning Institute and there is one near me that is associated with Emory University. I have to admit that in the past I have not been that impressed with the courses I have tried but I took a look at their offerings for Spring and it seems they are under new management.
I had thought I would take a jewelry making class at the art center near us but realized I wanted to learn something but not make anything! So signed up for two hour long classes on two different days at OLLI. I'll start "Art in Havana" and "Timely Medical Topics"
early in April.