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Description

81, Thallium  
Weasyl | Pixiv | Twitter | Inkbunny | Deviant Art
 
Scintillators for detecting gamma rays use sodium iodide doped with thallium. Historically, the heavy metal was used as a poison.
 
The font used for the symbol and book title is IBM Plex Sans. There are also a number of puns hidden.
 
SVG here.

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