Ritsu in Chinese / Japanese...

While this character literally means law, regulation or rules, it's also a surname Lü in Chinese and name Ritsu in Japanese.

In more ancient times (and for some people still), this can refer to East Asian criminal code, or vinaya (rules for the monastic community). For Japanese Buddhists, this can be the Ritsu school.

In some context, this can refer to certain musical scales used in Asia.