Goodbye in Chinese / Japanese...

再見 is the most common “goodbye” in Mandarin Chinese.

It literally/directly translates, “again see” or more naturally, “See you again.” It's a lot like the English, “See you later.”

Theoretically, this can be used in Japanese, but in Japanese, it's seen as the Chinese way to say goodbye. It's like English people saying ciao! or ¡adiós!

This is a strange title for a wall scroll. I guess it’s best if you plan to put this by the door where people will see it when they leave your home or business.

In Chinese, 再會 means to meet again, until we meet again, or goodbye.

In old Japanese, 再會 may be understood as a reunion or meeting again; though, in modern Japanese, you will see it written 再会.

This title can mean the Buddha of the Western paradise.

But it's more a chant that means “May the lord Buddha preserve us!” or “Merciful Buddha!.”

阿彌陀佛 is also a translation to Chinese, Japanese, and Korean for “Amitâbha Buddha.”

Asian Buddhists will often greet and say goodbye to each other with this phrase/chant/title.

The word namaste comes from Sanskrit and is a common greeting in the Hindi and Nepali languages exchanged by devout Hindu or Buddhist people in Southern Asia (especially India).

合十 is the Chinese form (not well-known in Japan) of this word which is used to describe a Buddhist (or Hindu) greeting with palms closed together prayerfully, generally at chest level. However, this selection of characters describes the act and is not a word spoken during the greeting. Words or a greeting are seldom spoken when two Buddhists meet. The greeting is silent and respectful but composed completely of body language.

Note that the greeting namaste and the act of placing palms together are used both as a hello and goodbye (like the word aloha in Hawaiian).

If you are looking for a welcoming hello and goodbye, you may want to consider gassho or a simple welcome.