Angstrom is a research rabbit possibly used by Widmore's team in tests they ran using the Hydra Island generator. Like the ones the DHARMA Initiative tested, it is an albino rabbit. It appears to live or at least spend significant amounts of time in a cage.
The white rabbit's name references Harold C. "Rabbit" Angstrom, the main character in five of John Updike's novels (Rabbit, Run; Rabbit Redux; Rabbit Is Rich; Rabbit at Rest; Rabbit Remembered). The novels follow a theme of the human themes of life, death, and redemption.
Ångström is a unit of length (0.1 nm). It is named after the Swedish physicist Anders Jonas Ångström (1814 – 1874) who worked at the Stockholm Observatory in the field of astronomy. Ångström studied terrestial magnetism, light, and optical phenomena - including studying light spectrums and wave lengths of light.
The ångström is often used to measure the wavelengths of electromagnetic radiation or other scales of wavelengths of light.