What is the Mac keyboard key with a symbol ⌅ of an up arrow pointing into a horizontal line? On a Mac, symbols are often used for keys rather than names. In Adobe Indesign for Mac, the keyboard shortcuts for inserting various break characters are described using what looks like an up arrow / caret / chevron pointing into a flat horizontal line:

 

It's the symbol on the right I'm asking about.

After much searching, I found it on the far bottom right of the full-size Apple keyboard. It's the... enter-like key (?) in the bottom right of the numeric keypad.



So two related questions:


What's it called?
Is it possible to trigger this key (for use in keyboard shortcuts) when using a keyboard without a numeric keypad (like a wireless keyboard or laptop keyboard)? If so, how?
It is called Projective, with Unicode U+2305, and it represents Enter which is different to Carriage Return, represented with a ↩. 

Although most of the time they work in the same way, there is a difference between Enter and Carriage Return. While Enter, in most cases, will make a GUI object operate at its default function, the Carriage Return is meant to reset the user's position to the beginning of the line of a text.

Just doing fn+Return should trigger it. 

On the short keyboards you'll either find the name or the icon.