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The meaning of a coat of arms varies from one to another. Each part of a coat of arms has symbolic value, from color, to the shape, to the items portrayed upon it.
Impale, I think
Colors and animals were, and are, used in coats of arms because they are used a symbols.
The plural of "coat of arms" is "coats of arms".
Coats of arms were used to identify individuals of high status on the battle field when they were otherwise unrecognizable in their armor.
Coats of arms do not themselves have surnames.
In the Middle Ages, coats of arms were used exclusively by the nobility on flags and armour. Fishermen would not have coats of arms.
Names do not have crests or coats of arms. Some individuals have coats of arms. Some families have crests; and some families of the same name do not.
heardly is the anwser
Coats of Arms belong to individuals, not to families.
Family crests or coats of arms started as paintings on shields to identify a warrior during a battle. During the medieval period the meanings of the paintings became formalised and changed from identifying a single person to identifying a family. Each design on the crest had a meaning. For instance gold rings on a coat of arms means that the family was wealthy. Spears meant the family had prowess in battle. Later coats of arms had motto's added usually written in Latin. Coats of Arms are generally applied to British, Irish and some European surnames (part of Heraldy). The surname Ahmed is unlikely to have a Heraldic background and therefore also unlikely to have a coat of arms. It is possible to design (or have designed for you) a modern coat of arms, which will have meaning to your current family but have no historical content or meaning
Coats of arms generally follow the rules of Heraldry.