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

All examples depict a process that transforms one object into another (two example input-output pairs are provided in every panel). In left-sorted examples, each input corresponds to a unique output, whereas in right-sorted examples, different inputs could potentially lead to the same output. There is a sense in which all the processes described on the right "lose" some amount of the input's information.

Reversible transformations vs. non-reversible transformations.

All examples depict a process that transforms one object into another (two example input-output pairs are provided in every panel). In left-sorted examples, each input corresponds to a unique output, whereas in right-sorted examples, different inputs could potentially lead to the same output.

In all examples depict a process that takes in an object and outputs another (two example input-output pairs are provided in every panel). In left-sorted examples, each input corresponds to a unique output, whereas in right-sorted examples, different inputs could potentially lead to the same output.

https://en.wikipedia.org/wiki/Injective_function#:~:text=In%20mathematics%2C%20an%20injective%20function,one%20element%20of%20its%20domain.

Injective functions from a set intuitively parsed as the pattern shared by the two objects on the left into a set intuitively parsed as the pattern shared by the two objects on the right. What that function is also relies on intuitive parsing.