The name Calm Cool in Chinese / Japanese...

These two characters mean calm and collected or simply not nervous.

鎮靜 represents the idea of being calm, cool, or relaxed in Chinese, Japanese Kanji, and old Korean Hanja.

My Korean dictionary further defines this as quiet, calm, tranquility, and pacification.
From my Japanese dictionary: calm, quiet, tranquility, appeasement, pacification.

Note: This term is also used in Korean Hanja but there is a slight deviation in the way they write the second character in Korean. Still, a Korean person who can read Hanja, will be able to read this word. We can write it in the Korean form if you wish (just let us know when you place your order). In Korean, this is the word you might use to tell someone to "calm down" or "take it easy."

冷靜 means calm and cool-headed in Chinese, Japanese, and Korean.

Other translations: calmness, composure, coolness, serenity, tranquility.

冷靜 is a good wall scroll for someone that wants to remind themselves to stay calm and level-headed.

See Also:  Sober Calm

不動心 is one of the five spirits of the warrior (budo) and is often used as a Japanese martial arts tenet.

Under that context, places such as the Budo Dojo define it this way: An unshakable mind and an immovable spirit is the state of fudoshin. It is courage and stability displayed both mentally and physically. Rather than indicating rigidity and inflexibility, fudoshin describes a condition that is not easily upset by internal thoughts or external forces. It is capable of receiving a strong attack while retaining composure and balance. It receives and yields lightly, grounds to the earth, and reflects aggression back to the source.

Other translations of this title include imperturbability, steadfastness, keeping a cool head in an emergency, or keeping one's calm (during a fight).

The first two Kanji alone mean immobility, firmness, fixed, steadfastness, motionless, and idle.

The last Kanji means heart, mind, soul, or essence.

Together, these three Kanji create a title defined as “immovable mind” within the context of Japanese martial arts. However, in Chinese, it would mean “motionless heart,” and in Korean Hanja, “wafting heart” or “floating heart.”

泰然自若 is a Chinese and Japanese proverb/word that means “cool and collected,” “showing no sign of nerves,” “perfectly composed,” “having the presence of mind,” “self-possessed,” “imperturbable,” and/or “calm and self-possessed.”