Sniffogram

Sniffogram: noun. A report on the various smells and sniffs that can be found in a specific area. Sniffograms are the foundations for the science of odourology and reading them has become a complex and precise art form. They have been described as a cross between a bar chart and a pie chart. All sniffograms must have at least 17 different colours represented as well as using all the letter of the alphabet. Anything that does not fulfil these requirements cannot be considered a sniffogram but is merely a "report on smells". The first sniffogram was created by Sir Humphry Davy in 1812 who used them in his efforts to determine the chemical nature of chlorine, nowadays known for its distinct smell.