佛法 can be defined as “The Law of Buddha,” “The Power of Buddha,” or simply “Dharma.”

達摩 is the Chinese and Japanese title for Dharma (a short name for Bodhidharma).

He's known in Chinese as Damo and in Japanese as Daruma.

Note: In Japanese, they tend to write the last character as versus . If you choose the Japanese master calligrapher, expect it to be written in the Japanese version.

佛法僧 is the Buddha, Dharma, and Saṅgha.

These three characters are the “Triple Gem” of Buddhism or the Buddhist Trinity.

法 is the simple way to write “law” or in a Buddhist context “Dharma.”

This can also mean method, way, or Buddhist teaching. It's also an abbreviation for the country of France.

The Buddhist context exists in Chinese and Korean Hanja but I have not yet confirmed that this means more than “law” when used alone in Japanese.

三寶 is the title for “Three Precious Treasures of Buddhism” or “The Triple Gem.”

These three treasures are the Buddha 佛, the Dharma 法 (teachings or the law of the Buddha), and the Sangha 僧 (the community of monks or followers).

This term is used by most (perhaps not all) Buddhists in China, Japan, and South Korea (written the same in the original form but pronounced differently in each language). Non-Buddhists may just read this as “Three Treasures” without the religious context. For instance, there is also a “Three Treasures of Chinese Medicine” that is sometimes titled the same way.

In modern Japanese and Simplified Chinese, this is written 三宝 instead of 三寶.

十法 is the title of the ten perfect or perfecting Mahāyāna rules.

The order of rules is as follows:
1. right belief.
2. right conduct.
3. right spirit.
4. the joy of the bodhi mind.
5. joy in the dharma.
6. joy in meditation.
7. pursuing the correct dharma.
8. obedience to, or accordance with dharma.
9. departing from pride, desire, etc.
10. comprehending the inner teaching of Buddha and taking no pleasure in attaining such knowledge or noting the ignorance of others.

This title is only used in the context of Buddhism. Japanese and Chinese people who are not familiar with Buddhism will not recognize this title.

布施 is the Buddhist practice of giving known as Dāna or दान from Pali and Sanskrit.

Depending on the context, this can be alms-giving, acts of charity, or offerings (usually money) to a priest for reading sutras or teachings.

Some will put Dāna in these two categories:
1. The pure or unsullied charity, which looks for no reward here but only in the hereafter.
2. The sullied almsgiving whose object is personal benefit.
The first kind is, of course, the kind that a liberated or enlightened person will pursue.

Others will put Dāna in these categories:
1. Worldly or material gifts.
2. Unworldly or spiritual gifts.

You can also separate Dāna into these three kinds:
1. 財布施 Goods such as money, food, or material items.
2. 法布施 Dharma, as an act to teach or bestow the Buddhist doctrine onto others.
3. 無畏布施 Courage, as an act of facing fear to save someone or when standing up for someone or standing up for righteousness.

The philosophies and categorization of Dāna will vary among various monks, temples, and sects of Buddhism.

Breaking down the characters separately:
布 (sometimes written 佈) means to spread out or announce, but also means cloth. In ancient times, cloth or robs were given to the Buddhist monks annually as a gift of alms - I need to do more research, but I believe there is a relationship here.
施 means to grant, to give, to bestow, to act, to carry out, and by itself can mean Dāna as a single character.

Dāna can also be expressed as 檀那 (pronounced “tán nà” in Mandarin and dan-na or だんな in Japanese). 檀那 is a transliteration of Dāna. However, it has colloquially come to mean some unsavory or unrelated things in Japanese. So, I think 布施 is better for calligraphy on your wall to remind you to practice Dāna daily (or whenever possible).