- The Void in the Underworld; the lowest region of the world
- A place of punishment for sinners; the opposite of Elysium
- The father of the monster Typhon who lies under Mount Aetna
- The online home of a disparate group of free software programmers and their projects
... but mainly it's just a name that I liked. (Mythology
references from Encyclopedia
You might like to find out about the people who make up Tartarus.