"Port" is the nautical term for the left-hand side of a boat or ship when facing forward toward the bow. It is used instead of "left" to provide an unambiguous, fixed reference point regardless of a sailor's orientation. Port is consistently marked with a red light at night.

Key Details and Origin:
Definition: The entire left side of the vessel, from bow to stern, when looking forward.

Opposite: The right side is known as "starboard".

Origin: Historically, ships were steered with an oar on the right side ("starboard"), so the left side was used to dock at ports to avoid damaging the rudder.

Name Change: Previously called "larboard," it was changed to "port" by the Royal Navy in 1844 to avoid confusion with "starboard" due to similar sounds.

Memory Tip: "Port" and "left" both have four letters.

Navigation: At night, the port side is indicated by a red navigation light.