Metal (tincture of gold) in heraldry
In heraldry, or (/ɔːʁ/; French for "gold") is the tincture of gold and, together with argent (silver), belongs to the class of light tinctures called "metals". In engravings and line drawings, it is hatched using a field of evenly spaced dots. It is very frequently depicted as yellow, though gold leaf was used in many illuminated manuscripts and more extravagant rolls of arms.
The word "gold" is occasionally used in place of "or" in blazon, sometimes to prevent repetition of the word "or" in a blazon, or because this substitution was in fashion when the blazon was first written down, or when it is preferred by the officer of arms. The use of "gold" for "or" (and "silver" for "argent") was a short-lived fashion amongst certain heraldic writers in the mid-20th century who attempted to "demystify" and popularise the subject of heraldry.
"Or" is sometimes spelled with a capital letter (e.g. "Gules, a fess Or") so as not to confuse it with the conjunction "or". However, this incorrect heraldic usage is not met with in standard reference works such as Bernard Burke's "General Armory", 1884 and Debrett's "Peerage". Fox-Davies advocated leaving all tinctures uncapitalized. A correctly stated blazon should eliminate any possible confusion between the tincture "or" and the conjunction "or" (which is rare in blazons in any case), certainly for the reader with a basic competence in heraldry. 
"Or plain" are the arms of Spanish family de Menezes.
Poetic meanings.
The different tinctures are sometimes said to be associated with special meanings and virtues, and with certain elements and precious stones, although these associations have been mostly disregarded by serious heraldists. Sources vary, but or is usually said to represent the following:
References.
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