The main device (symbol) in the Acklow blazon is the indented quarterly. The two main tinctures (colors) are azure and argent.
The bright, strong blue color in Heraldry is known in English as azure, and similarly in other European languages – azul in Spanish, azurro in Italian and azur in French. The word has its roots in the Arabic word lazura, also the source of the name of the precious stone lapis lazuli 1A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Azure. Despite this, those heralds who liked to associate colours with jewels chose instead to describe blue as Sapphire. According to Wade, the use of this colour symbolises “Loyalty and Truth” 2The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P36.
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) 3Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In a sketch or drawing it is represented by plain, unmarked paper 4A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P11.
Quarterly, as its name suggests is a method of dividing the shield into 4, more or less equal parts, conventionally of two alternating colours. 5A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Quarterly To further provide differentiation between arms the lines of the quartering can be given repeating patterns. An example of this is are lines drawn indented, i.e. in a saw-tooth pattern. An early author, Guilllim seeks to associate this decoration with fire 6A Display of Heraldry, J. Guillim, Blome, London, 1679, P39, and one can see the resemblance to flames. The visual effect is quite striking, an good example being the arms of DUNHAM (Lincolnshire), which are Azure, a chief indented or.