that's just a doodle of
a hyperelliptic Riemann SURFACE.
The Big Bang Theory Season 7, Episode 20
Can you recommend a SURFACE
The Big Bang Theory Season 7, Episode 18
...as the SURFACE of
an n-dimensional superfluid.
The Big Bang Theory Season 8, Episode 23
Then a laser will map
the reflective SURFACE...
The Big Bang Theory Season 6, Episode 5
or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10