Sankaku Channel/

Thanks, just as I suspected... :/ and is it possible that it has a name in general, for example in Japan? Because they have a quite similar phrase, the "zettai kuuiki", what refers the gap between upper thighs just under the crotch, but it's just not the same...

Edit: diortumsan, I support it! I like both, and the second one is really imaginative :D