P0 in pattern row

When knitting 1st Row PO(2:3:5:6)K2,P2,K6,(p2,K2,P2,K6)twice,P2,K2,PO(2:3:5:6)
Please could you explain PO

Welcome to KH!
What is the name of your pattern?
The pattern comes in several sizes and the numbers P0(2:3:5:6) refer to those sizes. If your pattern has a 0, skip that step and move on to the next.
For the first size, that means:
1st Row K2,P2,K6,(p2,K2,P2,K6)twice, P2,K2,