This Big Number Puzzle is based on the original puzzle by Dr. Francis O. Googol, a mathematician. Originally, the puzzle is to create a very large number using the numbers/symbols 1 2 3 4 ( ) . and - .

Let us have a modification of the puzzle. This time, let us create a very large number using the numbers 1, 2, 3 and the symbols (  ) + and - only once.
Let us see who could create the largest number possible. Write your answers in the comment box below.