The phrase "reload button" refers to a feature on electronic devices, like computers or web browsers, that allows you to refresh or restart a webpage or application by simply clicking a button. Full definition
You can even download ebooks with it and they show up in the Books folder, and the browser has back, forward, and reload buttons in the menu. (the-ebook-reader.com)
There is no traditional reload button, either, as the game will instead refill your ink tank as you swim through your team's ink covered areas using the left trigger. (shortpause.com)
But no such thing happens in Nexuiz, a game that recalls a time before reload buttons. (quartertothree.com)