Bose sued Thiel Audio in the early 1990s to stop the audiophile loudspeaker maker from using ".2" (point two) at the end of its product model "CS2.2". To comply with Bose's trademark of ".2" associated with the Bose Model 2.2 product, Thiel changed their model name to "CS2 2", substituting a space for the decimal point. Bose did not trademark ".3" so in 1997 when Thiel introduced the next model in the series, they named it the "Thiel 2.3", advertising "the return of the decimal point."