Wikipedia
Alláh-u-Abhá (, Alláh-u-Abhá; lit. God is the Most Glorious) is a greeting that Bahá'ís use when they meet each other. Abhá is a superlative of the word Bahá', and a form of the Greatest Name. Bahá'ís are asked to repeat the phrase Alláh-u-Abhá 95 times per day, as described by Bahá'u'lláh, founder of the Bahá'í Faith in the Kitáb-i-Aqdas, his book of laws. It can be compared to the Islamic Allah u Akbar (Arabic: God is Great) or Subhan Allah (how pure is God). Alláh-u-Abhá is used both when greeting someone or bidding someone farewell.
The form is the nominative of Allah, meaning " God". The form is the elative of the adjective , meaning "beauty, brilliancy". As used in the Bahá'i writings it is usually translated as "most glorious".