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1337: 1337: Leet or Leetspeak (often written in Leet as 1337 or 13375p34k) is a writing system used primarily on the Internet, but nowadays also in most online video games as well, which uses various combinations of alphanumerics to replace proper letters. Wikipedia
plenum: plenum: 1. In the philosophy of the Stoics, the whole of space regarded as being filled with matter.
2. An assembly or meeting with all members present.
3. A condition, space, or enclosure in which air or other gas is at a pressure greater than that of the outside atmosphere.
4. The condition of being full; fullness.
5. A space completely filled with matter. American Heritage Dictionary