Carriage Return, and Enter key.
Another name for a map legend is key.
Index key
note
the answer is key
Also called a Key field.
lanyard
map key
It is called a "key".
A map KEY.
Key Personnel?
The Return button is often called the Enter key. To be accurate about it, the Enter key is the one on the Numeric keypad. The Return key is on the main part of the keyboard. Both keys do the exact same thing. The Return key gets its name from the typewriter key that made the page return to the start of the next line. It is on the right side of the main keyboard and is one of the largest keys on the keyboard, with an arrow goind down and left on it.
Return the key to the front desk is the preferred construction, since that is where the key came from. The other construction requires an unspoken indirect object: Return the key (to the innkeeper ) at the front desk.