What's this mysterious symbol used for the insert page break shortcut in Apple's Pages?

According to the article Apple Mac OS X Keyboard Symbols, the symbol refers to the ENTER key.

And according to Apple, the shortcut keys to insert a Page Break is indeed:

Command + ENTER

or

Command + Return + Fn

As explained by Denis de Bernardy, Apple differentiates between the Enter key and the Return key, even if they are on the same physical location.

Press 'command' and the 'fn' keys, then hit return. (I have no idea what the key is in the drop down menu, either!)