Emptiness in Chinese / Japanese...

空 is a single character that means empty, void, hollow, vacant, vacuum, blank, nonexistent, vacuity, voidness, emptiness, non-existence, immateriality, unreality, the false or illusory nature of all existence, and being unreal.

In the Buddhist context, this relates to the doctrine that all phenomena and the ego have no reality but are composed of a certain number of skandhas or elements, which disintegrate. The void, the sky, space. The universal, the absolute, complete abstraction without relativity. The doctrine further explains that all things are compounds, or unstable organisms, possessing no self-essence, i.e. are dependent, or caused, come into existence only to perish. The underlying reality, the principle of eternal relativity, or non-infinity, i.e. śūnya, permeates all phenomena making possible their evolution.

From Sanskrit and/or Pali, this is the translation to Chinese and Japanese of the title śūnya or śūnyatā.

In Japanese, when pronounced as “ron” (sounds like “roan”) this can be a given name. It should be noted that this Kanji has about 5 different possible pronunciations in Japanese: kuu, kara, sora, ron, and uro. 空 is also an element in the Japanese version of the five elements.

According to Soothill 眞空妙有 means:
The true void is the mysteriously existing, truly void, or immaterial, yet transcendentally existing.

眞空妙有 is the state of being nonexistent after removing all errant worldly influences. 眞空妙有 is achieved when all forms of existence are seen for their real nature.

虛空 means empty space, empty sky, or void.

In the Buddhist context, it can mean “emptiness of the material world.” This can also be used as an adjective to modify other words with a meaning of unreal or insubstantial.

無 is the simple way to express “nothing.”

However, this single character leaves a bit of mystery as to what you might really mean if you hang it as a wall scroll. I'm not saying that's a bad thing; as you can decide what it means to you, and you won't be wrong if you stay within the general context.

More info: 無 is usually used as a suffix or prefix for Chinese and Japanese words (also old Korean). It can be compared to “un-” or “-less” in English. It can also mean “not to have,” no, none, not, “to lack,” or nothingness.

謙虚 is the most common way to say humble or modest in Japanese without a derogatory meaning (some other words suggest weakness, but this version holds a better humble meaning).

In Japanese, the first Kanji means self-effacing, humble oneself, and modesty. The second means void or emptiness.

See Also:  Moderation

地水火風空 is the specifically-Japanese version of the five elements.

This is a little different than the ancient or original Chinese version.

The elements are written in this order:
1. Earth / Terra / Ground
2. Water
3. Fire
4. Wind / Air
5. Sky / Emptiness / Void / Ether

Note: This set of Kanji can also be romanized as “ji sui ka fuu kuu,” “jisuikafuukuu,” or “jisuikafuku.”

These can also be written in the order 地火風水空 (chi ka sui fuu kuu). Let me know when you place your order if you want the Kanji to be in this character order.

虚実 is a Japanese word that means “falsehood [and] truth” or “fiction [and] fact.”

This concept is used in warfare, gameplay, and martial arts strategies. 虚実 can be a strategy of real and/or deceptive moves. This gets to some Sun Tzu Art of War stuff where in warfare a strategic move is either a real and serious move or it is a deceptive blow.

Let's explore each character in more depth:

虚 was originally written 虛 (there is a very subtle difference in the strokes at the bottom of the character) and means unpreparedness, falsehood, emptiness, void, abstract theory, empty or unoccupied, diffident or timid, false, humble or modest, virtual, or in vain.
In the Buddhist context, 虛 represents the Pali/Sanskrit word “śūnya,” meaning empty, vacant, unreal, unsubstantial, untrue, space, humble, or in vain.
In ancient Eastern/Chinese astronomy, 虛 represents the “Emptiness” constellation (one of the 28 mansions in the sky).

実 was originally 實 in Chinese (they currently write it as 实 in Simplified Chinese) with the meaning, truth, reality, sincerity, honesty, fidelity, and substance.
The Buddhist context is similar, adding real, true, honest, really, solid, definitely, sincere, solid, fixed, full, to fill, fruit, kernel, verily, in fact, the supreme fact, or ultimate reality to the definition.