Yá Bahá'u'l-Abhá
means "Oh, Glory of the All-Glorious".
Yá Bahá'u'lláhu'l-Abhá
means "Oh, Bahá'u'lláh of the All-Glorious".
On first glance it would appear that there are two dots, (diacritical marks), that don't seem to have a real reason to be there, other than to give this rendition a sense of balance. Explanation: The letter "yih" which is the last letter of Abhá has two dots under it, in its small form. In Abhá, it is written in its large form which does not usually have dots. It is considered permissible, however, to put the two dots under the large form also, for stylistic purposes. In this case Mishkín-Qalam, was exercising artistic license. (Click Here to see what I found at Bosch Bahá'í School one summer).