Prime universe
(Capcom's primary storyline)

The Hunter μ was a smaller version of the Hunter R. Several were held in storage in Raccoon City.

This Hunter has exactly the same attacks and fire-power resistance of the larger Hunter R. It may have been designed for an easy to store Hunter that could be delivered in larger quantities.

Further notes

"μ," pronounced "mu", is used to symbolise the word "micro"; this references their small size.