The RAL colour chart, or the “RAL colours”, is a specialized chart created by the RAL colour Institute to display different colours of paint, powder, varnish, plastics, etc. More info https://ral-colours.co.uk/.
The chart below gives the colour and the relevant number for a selection of the more commonly used RAL standard colours.
RAL is a colour matching system used in Europe. In colloquial speech RAL refers to the RAL Classic system, mainly used for varnish and powder coating but nowadays there are reference panels for plastics as well. Approved RAL products are provided with a hologram as of early 2013 to make unauthorised versions difficult to produce. Imitations may show different hue and colour when observed under various light sources.