The three main devices (symbols) in the Jalabert blazon are the ship, garb and Ceres. The two main tinctures (colors) are azure and or.
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.
Or is the heraldic metal Gold, often shown as a bold, bright yellow colour. It is said to show “Generosity and elevation of the mind” 3The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P35. Later heralds, of a more poetic nature liked to refer to it as Topaz, after the gemstone, and, for obvious reasons associated it with the Sun 4Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In drawings without colour it is usually represented by many small dots, or by the letter ‘O’ 5A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P76-77.
We do not need to look far to find the symbolism in the presence of a ship in a coat of arms, they appear regularly in the arms of port towns and merchant companies and families. They usually appear as a three masted wooden vessel known as a lymphad 6A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Shiop but are often described in some detail as to the disposition of their sails, presence and colours of flags and standards and so on. 7A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P294
Europe in the middle ages was still a largely agrarian society, and the wealth of the nobility resided in their estates and land. Since most people still lived and worked on the land they would find farm implements instantly recognisable, (an important feature for a coat of arms), even if they seem obscure to us today. 8Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 86 The garb for example is an ancient word for wheatsheaf, something now more frequently seen in Inn signs than in the field! 9A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Garbe
There are occaisional examples of mythical beings illustrated in a coat of arms, either as an image upon the shield, or as a supporter, and Ceres is an example of this. Any meaning must really be ascribed from the charateristics of that being themselves, nothing additional is added through their heraldic use.