The Lexus LQ name has been trademarked with the US Patent and Trademark Office by the luxury marque.
While the LS and LC ride on the company's latest GA-L passenger car platform, the LX is based on the Toyota LandCruiser.
The existence of the LX and its usage of the 'X' suffix may be the driving force behind Lexus' potential adoption of a new letter.
If the LQ name is used for the production version of the LF-1 Limitless, and the car is judged to be a success, the 'Q' suffix could be used for more crossover "coupes" — think RQ, NQ and UQ.
As we always note in articles about trademark filings, a new trademark doesn't necessarily mean a new product is in the works or, even if it is, that it will see the light of day.