Trying to Decipher Pin Function of A EM Relay (Data Sheet Included)
That is a double pole (DPDT) relay - it can switch two separate circuits, same as a DPDT toggle switch.

I would expect a datasheet to say "DPDT" or similar on the first page, but this one expects you to determine that from the circuit drawing you found, or to see "Two form C" on the contact specification table on page 7.  (A "form C" switch contact is a single pole double throw (SPDT) switch).