Miriam Webster defines "decor" as a noun having its origin in French décor, from décorer to decorate and from Latin meaning decorare. It is defined as 1) a stage setting; 2) decoration; and 3) the style and layout of interior furnishings.
Ok, so how often do you hear the phrase wrought iron decor? What is it? I guess one could say that wrought iron decor is any type of furnishing or decoration which involves the use of wrought iron, both inside and outside the home. That's a pretty broad category of furnishings! It could include curtain accessories, shelf brackets, mitten & boot hangers, switch and outlet covers, and much more.
If you want to search for specific wrought iron products which are included in the wrought iron decor category, I suggest you be specific as to what you are looking for such as a product group (i.e. curtain accessories) or a product itself (i.e. wrought iron curtain rod).
There is a very wide selection of wrought iron decor on the web and remember that the big retailer may not always carry the specific products you want or provide the quality customer service by boutique on-line retailers.