The Jožef Stefan Institute logo are letters IJS, written in 5-bit teleprinter code on punched tape.
The figure on the right is from the publication A look into the Jožef Stefan Institute 1949-1979 (in Slovene) written by Peter Likar and illustrated by Božo Kos.
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Logotype IJS
5-bit teleprinter code emulator
The Stefan-Boltzmann law states that the energy flux density by a blackbody is proportional to the fourth power of its thermodynamic temperature; because of their similarity, the Greek letter Sigma (representing the Stefan-Boltzmann constant) can be replaced with the logo of the Institute "Jozef Stefan":
 
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