What does the keyboard shortcut ⌥⇞ mean? I'm in need of a translator for ⌥ ⇞

This screen shot below is from the TexStudio and Texmaker latex editors.
⌥ - Is the Option key, also called Alt.

⇞ - It's called Upwards Arrow with Double Stroke, and usually represents page up. If your keyboard lacks that specific key, doing Fn+↑ does the trick.