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ruzuzu commented on the word Bourbaki dangerous bend symbol
"The dangerous bend or caution symbol ☡ (U+2621 ☡ CAUTION SIGN) was created by the Nicolas Bourbaki group of mathematicians and appears in the margins of mathematics books written by the group. It resembles a road sign that indicates a "dangerous bend" in the road ahead, and is used to mark passages tricky on a first reading or with an especially difficult argument."
-- https://en.wikipedia.org/w/index.php?title=Bourbaki_dangerous_bend_symbol&oldid=744753148
December 6, 2016