I will be damned if I can figure out the purpose of those things on the sign. No doubt some sort of attention-focusing neon, but they don't make sense.
Would they make sense if you lived in an era where there were many more such examples? Of course. Odd how that works. Visual vernacular is just as perishable as slang.
By the way, the back of the card lists all the usual attributes, and concludes thus:
"The Business Man's Asset."