The Double Helix are a sentient species that developed a space faring civilisation. They are carbon-based arthropods communicating through scents and pheromones. The name Double Helix comes from the shape of their spacecraft. It is not known whether they possess Faster Than Light technology. Initial contact with the Double Helix was made in the 27th century by a space Probe which was sent through an uncharted jump-point.
Source: Wing COmmander Universe.