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PI (circle number) - Mathematics - Nerd & Geek - Knit Cap with Cuff Print
PI (circle number) - Mathematics - Nerd & Geek
Octopi (PI) - Funny Geek & Nerd Humor (retro look) - Bandana
Octopi (PI) - Funny Geek & Nerd Humor (retro look)
Law of Gravity - Bandana
Law of Gravity