"Left heart" is commonly used to refer to the left side of the heart, which consists of the left atrium and left ventricle. Synonyms for the term "left heart" include "sinister heart", "portside heart", and "larboard heart". These synonyms draw analogies from seafaring terminology, where "sinister" denotes the left side of a ship, "portside" refers to the left side while facing forward, and "larboard" relates to the left side of a ship. While these synonyms may not be as widely used or recognized as "left heart", they can add a touch of uniqueness to medical discussions or writing about cardiac physiology.