They are all thrust limits used by the thrust management function of Boeing FMCs.
TO - Full rated take-off thrust.
TO1 - A fixed derate, typically 10% (airline selectable).
TO2 - A fixed derate, typically 20% (airline selectable).
CLB - Full rated climb thrust.
CLB1 & CLB 2 - Climb thrust derates that are gradually removed as the aircraft climbs. CLB1 typically uses a 10% derate of CLB thrust to 10,000ft, then increases thrust linearly with altitude to CLB thrust at 30,000ft. CLB2 typically uses a 20% derate of CLB thrust to 10,000ft, then increases thrust linearly with altitude to CLB thrust at 30,000.
The numbers quoted above may change for different airlines or aircraft types, but the concept is similar.