"Placeholder variable with no name" is the super-common feature from other language where you write, for example (not exact real syntax): (foo, _, bar) = fu

"Placeholder variable with no name" is the super-common feature from other language where you write, for example (not exact real syntax): (foo, _, bar) = function_returning_a_triplet(); since you only want the first and third items; the underscore is the placeholder. Useful feature, convenient feature, doesn't complicate your life as a programmer, no need to even remember it, it'll just come to you. Good thing to have in the language IMNSHO.