Definition of Mnemonic :
1.assisting or intended to assist the memory.
2.pertaining to mnemonics or to memory.
3.Something intended to assist the memory, as a verse or formula.
4.Computers . a programming code that is easy to remember,as STO for “store.”
THE ORDER OF THE PLANETS FROM THE SUN
(Sun - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto)
"Mom Visits Every Monday and Just Stay Until Noon, Period."
Others example just surf in internet by type " Mnemonic devices".