Use of Underscore(_) in Scala Language.
Briefly

val (_, _, result) = (1, 2, "Hello")println(result) // Output: Hello
numbers.map(_ * _) uses the map function to transform each element of the numbers list by multiplying it with itself.
_ * _ is a shorthand syntax for an anonymous function. In this context, it represents a function that takes two parameters and multiplies them together.
Read at Medium
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