KRAFTNERD is German for ‘power nerd’
If Sheldon, Leonard, Howard and Raj ever would have formed a real band (no Guitar hero plastic guitars, no cello, and especially no Tuvan throat singing) … this is what they would look like.
This is a parody of Kraftwerk’s iconic artwork for Die Menschmaschine (The Man Machine). Also see here
important side note
this is parody, the designer is neither affiliated with nor endorsed by any kind of record company or TV studio. this is no official merchandise either. it’s a spoof, nothing else.