Definition: The 9.3 List (aka "The 3+3" on a high school math test) is the most frustrating part of "nginx.conf," but it's not what you'd expect. It's actually quite simple and straightforward, but still requires some quick thinking to decipher.

Imagine this: You're trying to build your website with PHP and MySQL, but the 9.3 List keeps appearing, like an invisible enemy that threatens your website's security. It's like trying to navigate through a maze with the wrong path marked incorrectly - and you have no idea what "nginx.conf" is supposed to do in any case. It feels like you're in a world where everything needs to be perfectly straight and simple. But hey, if you can figure it out (which is just about anyone), it's not bad at all! Just keep on practicing and getting better, because the 9.3 List is only there to remind us that we should always try our best when working with something as complex as "nginx.conf."