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This sign brings six numbers to the party. You may think that at some point if you have enough numbers there will always be some relationship, however I can tell you from many submissions that is definitely not the case. The math here is not easy to find.

152 – ( 319 – 199 ) = 32 \bmod ( 64 + 28 )

This sign is found in Tanzania, but we are not exactly sure where. I inquired with the submitter if she might have GPS coordinates and she definitely does not. If you wish to find this sign for yourself, you will have to hunt it down. See sign on map!

Ed.: It was pointed out after posting by David Slauenwhite, who is on a trigonometry “jag” as of late, that there is a very elegant trigonemetry solution for this sign.

{ {\cos (152 + 28)^\circ} \over { \cos (319 – 199)^\circ} } = { 64 \over 32 } \rightarrow { \cos 180^\circ \over \cos 120^\circ } = 2 \rightarrow { -1 \over {- {1 \over 2} } } = 2 \rightarrow 2 = 2