v19 = _DWORDchar&unk_17440 + 4 a6;

This line of code declares a pointer variable named "v19" and initializes it to point to a specific memory location. The memory location is calculated based on the value of the variable "a6" and the address of another variable named "unk_17440".

The expression "&unk_17440" gets the address of the variable "unk_17440", and the "+ 4 * a6" part adds an offset to that address. The offset is calculated by multiplying the value of "a6" by 4 (since each element in the array takes up 4 bytes).

So essentially, this line of code is setting the pointer "v19" to point to the "a6"-th element in the array "unk_17440".