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(lambda (hobo) ... off-topic)

I see the lambda symbol everywhere and take it for granted it's the 
calling card of functional programming friends.

At the National Railroad Museum in Green Bay, I was surprised to see a 
lambda sign on a boxcar, and to learn that it, or more accurately, an 
upside-down y, was in the Great Depression a hobo sign meaning, "not 
only will the authorities lock you up here, but the local people are 
unfriendly too."

Geoffrey S. Knauth | http://knauth.org/gsk