Looks like XM files a trademark for the term "Nexus" - no clue as to what it means, but some interesting names coming down the pipe from those guys (Remora, Nexus, etc).

Word Mark NEXUS
Goods and Services IC 009. US 021 023 026 036 038. G & S: Satellite =
radio hardware
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 78696195
Filing Date August 19, 2005
Current Filing Basis 1B
Original Filing Basis 1B
Owner (APPLICANT) XM Satellite Radio Inc. CORPORATION DELAWARE 1500
Eckington Place, NE Washington D.C. 20002
Attorney of Record Cynthia Greer
Type of Mark TRADEMARK
Register PRINCIPAL
Live/Dead Indicator LIVE

Thanks CB!