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Jul 6, 2020 at 20:43 comment added Bill Johnson @TomaszKania. I think I first saw $! \cdot !$ in my undergraduate days when I took a course in functional analysis from Wilansky's book.
Jul 6, 2020 at 2:42 vote accept Tanmoy Paul
Jun 29, 2020 at 22:50 comment added Tomasz Kania Bill, your exclamation marks would have surely won a contest for the funniest norm symbol, if only there were one! :-)
Jun 29, 2020 at 13:31 history answered Bill Johnson CC BY-SA 4.0