This comment confuses me: "kill -l generally lists all signals". I thought that a signal means a quantized amount of energy.

[Added] Please, clarify the (computational) signal in Unix and the physical signal. Are they totally different concepts?

[Added] Are there major differences between paradigms? Is the meaning the same in languages such as C, Python and Haskell? The signal seems to be a general term.

unix signals operating-system
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