Ab (cuneiform)

The cuneiform sign. In the Akkadian language "b" and "p" are interchangeable; also, in cuneiform texts, any vowel can be interchanged with any other. The ab/ap sign also has a corresponding capital letter usage as a sumerogram, as found in the Epic of Gilgamesh for AB, the Akkadian language for šību, meaning "elder".
In the corpus of the Amarna letters, where ab/ap is also commonly found, the names occur of the authors of letters to the Pharaoh, for example Labaya and Ayyab, in both of which the syllabic use of "ab is found.
The usage numbers for the "ab" cuneiform sign in Tablets I-XII of the Epic of Gilgamesh are as follows: ab - 11, ap - 28 and sumerogram AB - 12. For ', Akkadian language for elder, only two spellings use "AB"; six other spellings of ' are syllabic/alphabetic.