T4 bacteriophage. A bacteriophage is a virus that attacks bacteria (bacteriophage = "bacteria eater").
The T4 is the most famous bacteriophage, both since it's a common research model, and since it looks awesome, reminiscent of a machine from outer space or something :-D
I've made this phage for an animation that is still in progress. Nothing really too interesting about the modeling or rendering process.
Microbiology cool, go create!