Radius Partners is a venture capital firm that specializes in investing in early-stage technology companies. The firm was founded in 2014 and is based in San Francisco, California. The term RADIUS PARTNERS can be broken down into two crossword solutions: ULNAS (5 letters). ULNAS stands for Upper Limb Nerve Anatomy System, which is a system of nerves that runs from the shoulder to the hand. This system is responsible for controlling movement and sensation in the upper limbs.