Add a little fan fiction to the mix.  Post a theory about Dean's necklace here.
 
   It's an amulet that protects Dean, and inturn protects Sam who had gifted it to Dean. It's their connection to each other. 

Theory 1:
 
It's an Egyptian protective symbol.
 
 
Theory 2:
 
A talisman, protection from an arch nemesis that has yet to appear on the show.
 
 
Theory 3:
 
A talisman of a horned beast.
 

Theory 4:

An symbolic animal that gives Dean powers.
 
 There is no theory. Castiel says exactly what it is. An amulet to find GOD!!!!
 Season 5!!!!

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Dean's black 1967 Chevy Impala, which bears the license plate KAZ 2Y5, was passed down to him by his father. It has been prominently featured on the series. The car is Dean's most prized possession, and he protects it with nearly the same ferocity with which he protects his younger brother. In the pilot episode, the trunk is revealed to hold various weaponry to fight the supernatural. Though it is damaged at the end of "Pilot," it is repaired and the car is featured throughout the first season until a tragic crash at the end of the season finale. The car is in repairs at the beginning of the second season, though Dean beats the trunk of the car with a tire iron in anger at the end of "Everybody Loves a Clown." It appears for the first time fully repaired in "Bloodlust" in an extended sequence to the soundtrack of AC/DC's Back In Black. Mind-controlled, Dean cheerfully gives the car to Andy Gallagher in "Simon Said," but the brothers soon recover it.

Source: wikipedia
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