The accusative sign in the original accusative is the fatha, true or false

The answer is: right.

The original accusative sign is the fatha, which is the inflection sign. It is used to denote the direct object in a sentence. It is true that the fatha is the original accusative sign. In addition, there are secondary signs of inflection such as damma, kasra, and sukoon. All these signs are used to indicate the indirect object in a sentence. So it can be concluded that the aperture is indeed the original accusing signal.