The three main devices (symbols) in the Canfield blazon are the fret, cinquefoil and fretty. 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.
The fret is a striking charge, often occupying the whole of the field and being two instersecting diagonal lines interlaced with the outline of a square. 6A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Fret It is believed to be derived from the image of a fishing net, which it does indeed resemble, and hence Wade believes that it should signify persuasion, although other writers regard it separately as the “the heraldic true lovers knot” 7The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P118
Natural objects abound in heraldry, and one category that gives especial delight are the many flowers and flowering plants that frequently occur 8A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P262. The cinquefoil is also of this type, being drawn, at least a little, realistically and often to very pleasing effect. It is shown as five-petalled flower, each petal quite rounded but with a distinct tip. It is sometimes pierced with a hole in the centre and usually appears on its own, without any leaves. 9A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Cinquefoil It has no fixed colour but can appear in any of the available heraldic tinctures.
Fretty is a very pleasing patterning of the field whereby it is split into diamond shapes by overlapping and interwoven diagonal bands, where the background and the band colours may be any of the heraldic tinctures. 10A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Fret. The family CAVE, from Kent are blessed with the simple arms of Azure, fretty or. Ancient writers, such as Guillim believed that the pattern represented a net and hence symbolised those skilled in the art of “persuasion”! 11A Display of Heraldry, J. Guillim, Blome, London, 1679, P234