plenum 

A filled space, or the concept of space as full of something.

1 a : a space or all space every part of which is full of matter b : an air-filled space in a structure; especially : one that receives air from a blower for distribution (as in a ventilation system)
2 : a general assembly of all members especially of a legislative body
3 : the quality or state of being full

Instead of thinking of the Universe as a vacuum dotted here and there with matter, consider it a plenum, a filled structure of space full of light, energy and particle/aniparticle pairs produced by the Zero Point Field fluctuation.

plenum by Greg Banville November 25, 2003

plenum 

end piece

vents

plenum by rosebud October 9, 2003

Penumbra Black Plague 

Possibly the best horror game on the planet working in five hours (unfortunately) of intelligent gameplay and brilliant story accompanied by a feeling of vulnerability as the only thing you can use is the ability to run from the skeletal monsters that _can and will kill you_. Lacking in some texture detail but excelling in every other aspect including but not limited to atmosphere, brilliant soundtrack, admirable voice acting, compelling story, very interactive physics, psychological destruction, and challenging puzzles, this game is simply amazing.

Penumbra Black Plague is the shit man.

Penumbra Black Plague by lee wolfgang April 13, 2009

penuminums 

The short version for peanut m&m's.

Man I could really go for some penuminums right now!

penuminums by Golden Grapefruit January 17, 2018

Orator non penum 

(Latin) Literally, "the speaker has no penis." In rhetoric, an unanswerable comeback to a nominally male opponent who believes in the magical powers of the so-called "logical fallacies" to replace the missing member and thereby to "win" an "argument."

A: Sometimes I wonder if Shakira really is as good as people say she is.
B (triumphantly): Argumentum ad populum!
A: Well met, good sir. However: Orator non penum.
Audience: (Raucous laughter).

A has won the argument.

Orator non penum by Pliny April 28, 2014

Penumbra 

An amazing gothic metal band from France. Similar to bands like trail of tears, sirenia, tristania and therion.

Listen to the album "Seclusion", highlight of Penumbra

Penumbra by artyq729 November 18, 2006

Penumbation 

Penumbation (noun)

The act of penumbating.

Jason demonstrated penumbation to his peers while aspirating acute thrombus.

Penumbation by Interventionalist August 21, 2018