What is a lipogram? It is a form of writing popular with a group known as OULIPO, that is to say ‘Writing Possibility Workshop’, although ‘lipo–’ may go back to Plato’s old word for ‘omit’. It’s all about omitting a basic unit (or two) from a particular composition. If you look at this paragraph in front of you, you don’t find any omission of A, I, O or U ….