It's the first "math-tan" to be associated with another subject, with my thanks to John's remark last week. The design was based on how there's only 3 tessellations with regular polygons (triangles, squares and hexagons), with a Schlafli symbol tossed in for good measure. There's an online tessellation artist at that link if you want to play around.
As an alternative link, the sign in the Connecticut deli asking to refrain from mathematics discussion has been explained.
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SIGNUM: Picking up an automated transmission.
QLOGAN: On screen.
SIGNUM: Ice cream?
PARA: I’ll put it up.
TESSIE (on viewer): Hiyo, Tessie Layshun here! Come to Art for all your tiling needs.
TESSIE (on viewer): We can Escher you right in, so keep us in your pattern buffer. Our ad is on the regional bulletin board. ... Hiyo, Tessie-- *click*
QLOGAN: Hmm, opinions?
SLOPE: I could go for some ice cream.