The main device (symbol) in the Hammencourt blazon is the mallet. The two main tinctures (colors) are argent and sable.
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) 1Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In a sketch or drawing it is represented by plain, unmarked paper 2A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P11.
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 3A 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 4Boutell’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 5The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P35.
It is important that a coat of arms be easily recognised and so everyday objects were frequently used as clearly identifiable charges – tools 6Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 69 being a common and important example of these, of which the hammer is typical. Some of these tools are rather obscure to modern eyes, who of us nowadays would recognise a hemp-break 7A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P163, let alone know what to use it for! The hammer is usually drawn conventionally, with a wooden handle and large metal head. 8A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Hammer