Sheldon Lee Cooper, Ph.D., Sc.D., a fictional character in the CBS television series The Big Bang Theory and its spinoff series Young Sheldon, portrayed by actors Jim Parsons in The Big Bang Theory and Iain Armitage in Young Sheldon (with Parsons as the latter series' narrator), utter words so as to convey information, an opinion, a feeling or intention, or an instruction involving the usage of the phrase known as 'bazinga'.