A corona can refer to different things depending on the context. Here are some possible meanings:

• Stellar corona: This is the outermost part of the Suns atmosphere, a luminous envelope of plasma that surrounds the Sun and other celestial bodies. It is extended to millions of kilometers into space and is commonly seen during a total solar eclipse. The corona is much hotter than the Suns visible surface, but it is also much less dense, which makes it much less bright than the surface of the Sun.

• Corona (beer): This is a Mexican beer.

• Corona (cigar): This is a long cigar having the sides straight to the end to be lit and being roundly blunt at the other end.

• Corona (card game): This is a solitaire card game.

• Corona (novel): This is a Star Trek novel by Greg Bear.

• Corona (band): This is an Italian music group.

• Corona (Takemitsu): This is a piece of music by Japanese composer Toru Takemitsu.

• Corona (glans penis): This is the rounded ridge at the base of the glans penis.

• Corona (graph theory): This is a kind of binary operation on two graphs.

• Corona (rotifer): This is the anterior lobes of a rotifer.

• Corona (mathematics): This can refer to several mathematical concepts, such as the corona theorem in complex analysis, the corona algebra of a C*-algebra, or the corona set of a topological space.

• Corona (physics): This can refer to the corona of a star, as described above, or to other phenomena such as the corona discharge or the corona effect.

In general, a corona can be described as a circle or ring of light around an object.