PORT is a red wine, and red is the left side of politics. Red Left Port. There’s always some red port (wine) left.

Mnemonic Device:

• PORT is a red wine, and red is the LEFT side of politics.
• Red Left Port.
• There’s always some Red Port (wine) Left.

Explanation: to remember the name of the vessel’s left side, and the light color on the port side.

Additional Note: PORT and LEFT both have four letters.