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"The designation XAAM-N-9Sparrow X was allocated to a proposed nuclear-armed Sparrow derivative in 1958 with a low-yield W-42 fission warhead. However, this proposal was short-lived and the Sparrow X was cancelled early in the design stage."
According to Air Force documents, the "Sparrow X" was intended to carry a "fractional kiloton" warhead, with a range between 6 Miles at sea level, to 25 miles at high altitude, with a service ceiling of 80,000 feet. Intended carrier aircraft is unknown—although, by the numbers, an F-106 would have been able to carry a single missile internally.