Anfalas, the One True God's page

Can someone help me with the cost of creating an amulet of life protection a.k.a. death ward. It has 10 charges per day. This is what I have so far, but I getting confused on the "divide by (5 divided by the charges per day)."

cl 7 x spell level 4 x 2000 = 56,000gp from that point i'm lost.

I'm a little confused on what's PI in Pathfinder.

It says "All trademarks, registered trademarks, proper names (characters, deities, artifacts, places, etc.), dialogue, plots,
storylines, language, concepts, incidents, locations, characters, artwork, and trade dress."

Now I understand trademarks, registered trademarks, proper names, dialogue, plots, storylines, locations, characters, artwork, and trade dress. Those are easy.

The thing I don't understand is langauge, concepts, and incidents. Can anyone explain this to me?

Thanks,
Anfalas