Acronym it. This has become such a problem that it is even evaluated at the level of medical academies such as the American Academy of Dermatology. Acronyms are often taught as mnemonic devices, for example in physics the colors of the visible spectrum are said to be "ROY G. BIV" ("red-orange-yellow-green-blue-indigo-violet"). They are also used as mental checklists, for example in aviation: "GUMPS", which is "Gas-Undercarriage-Mixture-Propeller-Seatbelts". Other examples of mnemonic acronyms are "CAN SLIM", and "PAVPANIC" as well as "PEMDAS". It is not uncommon for acronyms to be cited in a kind of false etymology, called a "folk etymology", for a
Planetary mnemonic 30, 2006. This mnemonic is used by the IAU on their website for the public. Others angry at the IAU's decision to "demote" Pluto composed sarcastic mnemonics in protest. Schott's Miscellany by Ben Schott included the mnemonic, "Many Very Educated Men Justify Stealing Unique Ninth". Mike Brown, who discovered Eris, mentioned hearing "Many Very Educated Men Just Screwed Up Nature". One particular 9 planet mnemonic, "My very easy memory jingle seems useful naming planets", was easily changed once the demotion occurred, becoming the 8 planet mnemonic, "My very easy memory jingle seems useless now". Slightly risque versions include, "Mary's 'Virgin'