Lately i have seen the word TOC in reference to TOC venus and in front of other plane names,
What does TOC mean?

I would assume it's a reference to the Tournament of Champions which was an RC competition.

http://www.desertaircraft.com/toc02/index.html explains it about as well as anything.

Unfortunately, the real TOC died with it's founding sponsor. The family just didn't want to shell out that kind of money. I suppose if you're not into RC, spending tens of thousands of dollars on it every year isn't rational.
Dennis-