Courtesy of Geek Alert (hat tip: who else? Cliff Pickover)
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prior probability 
I have something like this in my office (thanks to my nerdy children) but the repeating decimal, “g” and hex code are new twists. Makes me think there could be a clock with just fundamental constants on the face. (They could put *i* on the reverse face of the clock!)
Wonderful idea for reverse side of the clock. By the way, the intersection between nature’s constants and their representation in abstract universal symbols never ceases to amaze me!
Cool! You can find several different versions at Amazon:
https://www.amazon.com/s/ref=nb_sb_ss_c_0_10?url=search-alias%3Daps&field-keywords=math+clock&sprefix=math+clock%2Caps%2C169