Undergrad Is this the Fourier Number, or some other formula?

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The discussion centers around a formula observed on a building in Korea, initially thought to relate to the Fourier number. Participants speculate that the formula could represent the fundamental frequency of a vibrating string or rod. There is a suggestion that it might also pertain to the fundamental frequency of the brick wall, potentially as an inside joke among the architects and engineers. The mention of earthquakes adds context to the interpretation of the formula. Overall, the conversation explores the possible mathematical and architectural significance of the formula displayed.
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This is on a building in Korea, and the F0 made me think of the Fourier number, but the rest of the formula is unfamiliar to me. Does anyone recognize it?
 

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It looks like the fundamental frequency of a vibrating string or rod.
 
It might be the fundamental frequency of the brick wall, a private joke between the architects and engineers, since earthquakes are possible and the "writing is on the wall".
 
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