Eight in Chinese / Japanese...

黑八馬 means “eight black horses” in Chinese.

This is an unusual title for calligraphy, but several people have searched for it, so we added it.
Eight horses are a sign of success in business in Chinese culture.

八卦 is the Chinese title for Bagua or Ba Gua.

Simply put, this represents the eight elements often seen around the yin-yang symbol.

八卦掌 is the title Baguazhang, a form of Chinese boxing.

Literally translated, this means “Eight Trigrams Palm.

You will see this romanized as “Ba Gua Zhang,” or “Pa Kua Chang” (same characters, just different romanization used in mainland China versus Taiwan).

八卦掌 is also known in Japan as hakkeshou or hakkesho.

八極拳 is “Ba Ji Quan” or “Eight Extremes Fist.”

Some also translate this as “Eight Extremities Fist,” though I don't feel that's accurate.

八極拳 (Bājíquán) is a Chinese martial art that features explosive, short-range power and is famous for its elbow strikes. It originated in the Hebei Province in Northern China but spread to Taiwan and other places.

The full title is 開門八極拳 (Kāimén Bājíquán), which means Open-Door Bajiquan.

Other romanizations include: BaJiQuan, Pa Chi Ch`üan, or Pa Chi Chuan.

In Japan, this is known as Hakkyokuken.

龍神 is a Chinese, Japanese Kanji, and old Korean Hanja title that can mean “dragon god,” “dragon king,” or “dragon spirit.”

In the context of Buddhism, this is one of eight kinds of spiritual beings found in Mahāyāna texts.

八 is the number eight in Chinese, Japanese Kanji, and old Korean Hanja.

八 is a strange selection for a wall scroll, so it's here mostly for reference. I guess it's OK if the number eight is important to you.

Because this character is rather simple (just two strokes), 捌 instead of 八 is an anti-fraud way to write eight on bank documents.

八仙 is the Chinese title for the Eight Immortals of Daoist / Taoist mythology.

In Japanese, this can be the given name Hassen.

七転八起 is a Japanese proverb that relays the vicissitudes of life, with the meaning “seven times down eight times up.”

Some would more naturally translate it into English as “Always rising after a fall or repeated failures” or compare it to the English, “If at first, you don't succeed, try, try again.”

The first Kanji is literally “7.” The second means “fall down” (sometimes this Kanji means “turn around,” “revolve” or “turn over” but in this case, it holds the meaning of “fall”). The third is “8.” And the last is “get up,” “rouse,” or “rise.”

Basically, if you fail 7 times, you should recover from those events and be prepared to rise an 8th time. This also applies if it is the world or circumstances that knock you down seven times...
...just remember that you have the ability to bounce back from any kind of adversity.

Note: This can be pronounced in two ways. One is “shichi ten hakki” or “shichitenhakki.” The other is “nana korobi ya oki” also written, “nanakorobi-yaoki.”

Special Note: The second character is a Kanji that is not used in China. Therefore, please select a Japanese calligrapher for this title.

仙 means immortal (as in a being or person).

In some contexts, it can mean hermit, ascetic, man of the hills, or wizard. The Buddha is often put in this category.

In Chinese mythology and folklore, there is a famous group of eight immortals (八仙).

The 楞嚴經 (Śūraṅgama Sūtra) speaks of many kinds of immortals including walkers on the earth, fliers, wanderers at will (into space or into the deva heavens), beings with the ability to transform themselves into any form, etc.

These are the eight tenets of the Buddhist Noble Eightfold Path written altogether.

Here's this list of tenets in English:
1. Right View / Right Understanding / Right Perspective / Perfect View
2. Right Resolve / Right Thought / Right Intention / Perfect Resolve
3. Right Speech / Right Talk / Perfect Speech
4. Right Action / Perfect Conduct
5. Right Living / Right Livelihood / Perfect Livelihood
6. Right Effort / Right Endeavor / Perfect Effort
7. Right Mindfulness / Right Memory / Perfect Mindfulness
8. Right Concentration / Perfect Concentration

Peng, Lu, Ji, An, Cai, Lie, Zhou, and Kao are the eight fundamentals or forces of Tai Chi Chuan or Taiqiquan.

棚 (Peng) refers to the outward (or upward) expansion of energy.
履 (Lu) is often referred to as “rollback.” Lu is the ability to absorb, yield/deflect incoming force.
擠 (Ji) is often thought of as a “forward press.” However, it is also best described as a “squeezing out of space.”
按 (An) is a downward movement of energy, best translated as “(relaxed) sinking.”
採 (Cai or Tsai) translated as “downward pluck.” Cai is a combination of Lu and An.
列 (Lie or Lieh) is “Split” and is a combination of Peng and Ji.
肘 (Zhou) Elbowing.
靠 (Kao) Shouldering (for when the arms are bound/distance is too close to punch).

Source: https://combativecorner.wordpress.com/2015/12/03/the-8-energies-and-5-movements-of-taijiquan/