Unicorn Belt – <MtH, WoH, AoV, JRMN, HoS, ACtD> The innermost and richest of Manticore B's three asteroid belts, O - 21,7 [See 1)]. "The Unicorn Belt's asteroid extraction operations produce the lion's share of the Star Kingdom's raw ores." Hauptman Cartel's Gryphon Minerals Ltd., subsidiary ownes "about 30% of it outright, with long-term leases on another third. The cartel had built enormous extraction centers and smelters to service its mining operations." The Harrington County Lands created by Elizabeth III after Honor Harrington's "death" on Hades, were a part of the Crown Reserve in the Unicorn Belt.
Urako – <FS, TW> The settled planet in the Kenichi System. Andreas Whittaker came to Sphinx with his fater's scientific team to study treecats from Urako.
Uriel (Yeltsin VI) – <HotQ, HoS, B> A gas giant larger than Jupiter in the Yeltsin System, O - 51. One of its moons is Blackbird. Thanks to its great mass the planet has its own HL of “almost” 5 LM.
1) The table listing the planets of Manticore B in JRMN puts Unicorn Belt's orbit at 21,98 LM, but the Manticore B system map in HoS gives 21,7 LM. I'm going with the one from HoS, as it's the newest and most canon material on Manticore B's astrography.