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I'd use ¬ and ^ or ~
It depends on context. I've a UK keyboard, Linux (more AltGr characters) and the CapsLock mapped as Compose, so plenty of choice. I first search to make sure the replacement character isn't used.
þ ß ð ĸ ł § « » · Ω ® Ŧ đ ŋ etc are on the AltGr
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