Reja is a Spanish term for grillwork. It typically refers to iron screens, often of a decorative nature.Milliken, William M. "Decorative Ironwork." World Book Encyclopedia. 10th ed. 1972. 365-66.
In medieval times the word was used for ploughshare. It is used in this sense in the Becerro Galicano.
Domestic rejas In a domestic context, rejas usually refers to window grilles.
They played a role in Spanish courtship rituals, and are referenced by Granados in Goyescas where the composer depicts a romantic dialogue between lovers.
Ecclesiastical rejas Inside cathedrals, fences were often placed in front of side chapels, the choir, or even in rood screens in front of the altar. "reja." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 02 Apr. 2009 <http://www.britannica.com/EBchecked/topic/496745/reja>. Such rejas are commonly 25 to 30 ft (7.5 to 9 meters) high.
Crafters who made rejas were known as rejeros, or reja-makers.Byne, Arthur, and Mildred Stapley. Spanish Ironwork. 1915.
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