The two main devices (symbols) in the Meldrum blazon are the otter and unicorn. The two main tinctures (colors) are sable and argent.
Sable, the deep black so often found in Heraldry is believed to named from an animal of the marten family know in the middle ages as a Sabellinœ and noted for its very black fur 1A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Sable. In engravings, when colors cannot be shown it is represented as closely spaced horizontal and vertical lines, and appropriately is thus the darkest form of hatching, as this method is known 2Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 26. Although it may seem a sombre tone, and does indeed sometimes denote grief, it is more commonly said to represent Constancy 3The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P35.
Argent is the heraldic metal Silver and is usually shown as very pure white. It is also known more poetically as pearl, moon (or luna) 4Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In a sketch or drawing it is represented by plain, unmarked paper 5A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P11.
Otters were more common in the middle ages and were a favourite prey for hunting, so we should not be surprised to find them depicted on coats of arms. They appear in quite realistic form and may be collared and shown eating fish. 6A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Otter
In the mediaeval period there was no real percieved difference between real and mythical animals, after all, much of the world remained unknown and who was to say what strange and magical creatures existed in distant lands? As heraldry developed a whole menagerie of imagined creatures 7Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P164 came into being, and their various representations became more or less standardised in form and appearance. The unicorn is an intresting example that is still part of our own mythology today. The unicorn as illustrated on even the most ancient coat of arms is still instantly recognisable to us today, and shares many of the same poses that both lions and horses can be found in. 8A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Unicorn. Wade, the 18th century heraldic writer suggested that were adopted as symbols because of “its virtue, courage and strength”. 9The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P85