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 unwavering mind, immovable mind, unwavering composure, 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.”

不動解脫 is a Buddhist term that refers to liberation from being disturbed by the illusions of life.

In short, this can be called “immovable liberation.”

This allows one to remain unaffected by the impermanent things such as emotions, attachments, desires, and greed of the world.

不動心道場 can be translated as “Fudoshin Dojo,” or “Immovable Mind Hall,” depending on usage.

不動心 = Fudoshin or immovable mind.
道場 = Dojo or training hall.

不動心道 can be translated as “Fudoshin-Do,” or “Immovable Mind Way.”

不動明王 is the fierce form of the Buddha Vairocana, and the most important of the Myō-ō or Ming Wang class of deities.

Romanized as Fudō Myō-ō, in Japanese Buddhism or Bùdòng Míngwáng / Pu-Tung Ming-Wang in Chinese Buddhism,

Originally Acala/Achala (अचल “The Immovable”), Acalanātha (अचलनाथ “Immovable Lord”) or Āryācalanātha (आर्याचलनाथ, “Noble Immovable Lord”).

In English, this deity is sometimes called “Wisdom King.”

不動心館 can be translated as “Fudoshinkan,” or “Immovable Mind Hall.”

Fudoshinkan (不動心館) refers to various Japanese martial arts schools, primarily focusing on Aikido, Iaido (sword art), and Jodo (short staff), emphasizing the concept of Fudoshin (不動心) – a calm, immovable mind in the face of challenge, reflecting traditional samurai spirit through dynamic training and inner peace

Immovable mind; unwavering composure. Hall/school (as in -kan / -gwan).

安住不動 means at peace and immovable.

The first two Kanji mean being content with one's present position or well-composed.
The last two Kanji mean immobile, firmness, fixed, and/or motionless.

In the Zen school, this is being well-composed and immovable - the ideal state of Zen meditation.

不動心流 can be translated as “Fudoshin-Ryu,” or “Immovable Mind Style.”

不動心会 can be translated as “Fudoshin-Kai,” “Immovable Mind Association,” or “Unwavering Society,” depending on usage.

不動心拳法 can be translated as “Fudoshin Kenpo/Kempo,” or “Immovable Mind Fist Law.”

不動心協会 can be translated as “Fudoshin Association,” or “Immovable Mind Association,” depending on usage.

風林火山 is the battle strategy and proverb of Japanese feudal lord Takeda Shingen (1521-1573 AD).

This came from the Art of War by Chinese strategist and tactician Sun Tzu (Sunzi).

You can think of this as an abbreviation to remind officers and troops how to conduct battle.

風林火山 is a word list: Wind, Forest, Fire, Mountain.

The more expanded meaning is supposed to be...

“Swift as the wind, quiet as the forest, fierce as fire, and immovable as a mountain”

“As fast as the wind, as quiet as the forest, as daring as fire, and immovable as the mountain”

“Move as swift as the wind, stay as silent as a forest, attack as fierce as fire, undefeatable defense like a mountain”

“Move swiftly like the wind, stay silent like the forest, attack fiercely like fire, take a tactical position on the mountain”

See Also:  Art of War