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Re:ØMQ – The Guide (2011) by chromatin on Saturday October 24, 2020 @06:05PM (#24882278)
Or, you know, U+2205, the mathematical "empty set" notation.

https://en.wikipedia.org/wiki/Null_sign

Re:ØMQ – The Guide (2011) by punnerud on Saturday October 24, 2020 @06:11PM (#24882308)
∅ is different, but maybe hard to distinguish if you are not used to Ø/ø(∅ see)