The three main devices (symbols) in the Gillum blazon are the chevron, dolpin and castle. The two main tinctures (colors) are sable and or.
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.
The bright yellow colour frequently found in coats of arms is known to heralds as Or, or sometimes simply as Gold.4Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 27. Along with, argent, or silver it forms the two “metals” of heraldry – one of the guidelines of heraldic design is that silver objects should not be placed upon gold fields and vice versa 5A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P85. The yellow colour is often associated with the Sun, and the zodiacal sign of Leo.6Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53.
The chevron is one the major shapes used upon a shield, known as ordinaries. The inverted ‘V’ of the chevron is perhaps thought to have originated to represent a military scarf folded on the shield 7A Display of Heraldry, J. Guillim, Blome, London, 1679, (various), or additional cross-pieces used to strengthen the shield and painted a different colour.8The Pursuivant of Arms, J. R. Planche, Hardwicke, London 1859. It has also acquired the meaning of “Protection… granted… to one who has achieved some notable enterprise” 9The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P45, possibly becuase of its resemblance to the roof truss of a house.
In the days before television and the internet it was a rare heraldic artist that had ever seen a dolphin for real, so we should not be surprised that the heraldic representation is not instantly recognisable. Despite this, we should not forget that these artists considered the dolphin to be the king of fish, playing the same role as the lion in the animal kingdom. 10A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Dolphin For reasons not immediately clear, Wade suggests that the dolphin was regarded as an “affectionate fish, fond of music”. 11The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P83
Architectural items, from individual components to entire buildings 12Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 92 feature frequently as charges In a coat of arms. Not surprisingly, considering the times from which many arms date, fortifications are common. The castle is perhaps second only to the tower in this usage, and often described in some detail as to its construction, the disposition of windows and so on. 13A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Castle Continental examples also sometimes include attackers on scaling ladders. Wade tells us that the appearance of a castle indicates “granduer and solidity” and one can understand why. 14The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P100