The penumbra is the part of a shadow where the light source is only partially blocked.
Penumbra may also refer to:
Entertainment Penumbra (band), a French gothic metal band "Penumbra", a song by John Ireland "Penumbra", a song by Tortoise "Penumbra" (Star Trek: Deep Space Nine), a 1999 episode of Star Trek: Deep Space Nine Penumbra (TV series), Mexican telenovela Penumbra (World of Darkness), a region in the World of Darkness line of role-playing games Penumbra, a series of video games by Frictional Games consisting of: Penumbra: Overture Penumbra: Black Plague Penumbra: Requiem
Companies Penumbra Theatre Company, an African American theatre in Saint Paul, Minnesota Penumbra (medical company), in Alameda, California
Other uses Penumbra (law), a metaphor for rights implied in the United States Constitution Penumbra (medicine), surviving tissue at the margin of an ischemic event (such as a stroke) which is in danger of hypoxia and subsequent cell death Penumbra (Sun), the ring-shaped semi-bright region of a sunspot that surrounds the darker umbra Penumbral lunar eclipse, an eclipse that occurs when the Moon passes through the Earth's penumbra
See also Umbra (disambiguation)