Hook sizes go from small to large in this format.
If it starts with # (number), then it goes from small to large like this:
#10, #8, #6, #4, #2, #1
Then, continuing from small to large it changes to the oughts like this:
1/0, 2/0, 3/0, 4/0, 5/0, etc
Put it all together from smallest to largest:
#10, #8, #6, #4, #2, #1, 1/0, 2/0, 3/0, 4/0, 5/0
There are smaller than #10's and larger than 5/0's though.
