In the past, when literacy rates in India were low, Indian Railways gave these symbols and colours so all the passengers can understand different coaches' alignment.

Condor is hosting a “Match the Stripes” contest where passengers can earn a 10-euro voucher by dressing in stripes.

You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.