Ac is the long a sound “ah”
Anglo-Saxon Rune Poem (from ragweedforge.com)
The oak fattens the flesh of pigs for the children of men.
Often it traverses the gannet’s bath,and the ocean proves whether the oak keeps faithin honourable fashion
Ac reversed is the rune of instability, ungroundedness and being unproductive. It can be seen as an indication of deception, fraud and insincerity. It often indicates that a person or people may break their commitments, go back on their word, or be actively engaging in trying to deceive and trick you. It might also point to yourself, asking you to check and see if the commitments you have made you really keep or at least intend to keep, or if you breaking your word and violating trust that has been put on you.