smoke ring

This term describes a specific aerodynamic phenomenon where a vortex ring is formed. It is most commonly associated with leisure activities, such as smoking pipes or cigars, or as a feat of skill in performance art and magic. The term carries a connotation of precision and control, as creating a stable, symmetrical ring requires a specific technique of exhaling.

Because the term refers to a distinct, observable physical object, it is treated as a standard countable noun. It is typically used in singular or plural forms to describe the number of rings produced during a single session of blowing.