Coat of arms of Haarlem supported by mermaids. 1625 Pen and brown ink and brown wash.
In heraldry and Coats of Arms, the mermaid or merman is a favourite symbol for seafarers or anything related to the sea. The merman was also referred to as a triton and siren was occasionally an alternate name for the mermaid. Both are symbols of eloquence.
In heraldry. the merman is usually found as a supporter and less often as a charge on a shield.
The mermaid is much more common and is generally represented with the traditional mirror and comb in her hands.
A Melusine is a mermaid with two tails disposed on either side of her, commonly found in German heraldry.