The main device (symbol) in the Langworth blazon is the dragon. 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.
Dragons have a long history in Heraldry and indeed have come to symbolise entire countries. Originally they were perhaps based on garbled descriptions of crocodiles given by returning travellers but soon developed a widely accepted representation. 6A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Griffin Wade suggests that their appearance signifies “a most valiant defender of treasure”, a trait of dragons that we are still familiar with today. 7The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P86