律 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.

紀律 is a Chinese and Korean word that conveys the idea of extreme self-control and perhaps self-sacrifice, and obedience.

This word matches the kind of “discipline” I was in the Marine Corps. There is also an additional idea of maintaining order or being orderly in your tasks.

This idea would also fit an athlete training for the Olympics who gives up many pleasures to stay focused on their training.

規律 is a Japanese word for discipline that relays the ideas of keeping order, and observance (of rules, laws, regulations).

This is also a word in Chinese and old Korean Hanja where it suggests that you are one who follows a certain law of behavior or has a regular and dependable pattern of behavior, personal regime, or rhythm.

自律 means self-discipline and self-control.

It is doing what you really want to do rather than being tossed around by your feelings like a leaf in the wind. You act instead of reacting. You get things done in an orderly and efficient way. With self-discipline, you take charge of yourself.

Not sure if this one works for a Japanese audience.

黄金律 is “The Golden Rule” in Japanese.

It's understood to mean “do unto others as you would have them do unto you.”

This is the Chinese name for the country of the Philippines.

提防律師 is a kind of Chinese joke about lawyers.

The first two characters mean “guard yourself against (an attack)” or “beware.”
The last two characters can be translated as lawyer, attorney, or solicitor.

Separately, those characters mean law/regulation/control and master/expert/teacher. Here, you can see the attorney meaning is pretty clear in the individual characters.

Please note this is Chinese only (it won't make sense in Japanese, and the last two characters are sometimes translated together as “Buddhist Priest” in Japanese).