Three-way comparison - Wikipedia

In computer science, a three-way comparison takes two values A and B belonging to a type with a total order and determines whether A < B, A = B, or A > B in a single operation, in accordance with the mathematical law of trichotomy. It can be implemented in terms of a function (such as strcmp in C), a method (such as compareTo in Java), or an operator (such as the spaceship operator <=> in Perl and

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Trivia: <=> is called the spaceship operator because of a resemblance to a spaceship from Star Wars.

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