Where can I find the detailed explaining of the following symbols?

Where can I find the detailed explaining of the following Explain Plan related symbols?
PCWP
:TQ
TQ

The Performance Tuning Guide (http://download.oracle.com/docs/cd/E11882_01/server.112/e10821/ex_plan.htm#i26005) tells us:
PCWP = Parallel Combined With Parent
TQ=Table Queue number
The Performance Tuning Guide contains some really great material on how to read execution plans.
RTFM then follow up here with specific examples that you are struggling with.
We will help you, but you need to show initiative.

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