أَقْبِلْ
Come forward.
Naming the person called might tell everyone present who is being addressed. If the intended person already understands from the situation that the instruction is for him, omitting the name can avoid informing others.
In concealing the matter from non-addressees, the omitted element is often the addressee’s identity. The omission works only if the intended recipient understands; otherwise it merely produces ambiguity.