A mnemonic based on every 5th item to be
remembered, using one's fingers as a kind of abacus.
You put up one finger for each one as you go along. When you reach the fifth finger, that becomes the first letter of the mnemonic. This device works well when the number of entities to be recalled is too large for conventional mnemonics to easily
accommodate.
Example: Nlnci Sjgai is one possible pentamnemonic for
all the countries with some coastline on the continent of Eurasia. If you start with the western-most point-Portugal-and go clockwise around the coast, your first 'bookmark country' is
Netherlands, and you end with Italy. (Just add on Monaco, the 51st country) Portugal, Spain, France, Belgium, NETHERLANDS: Germany, Denmark, Poland, Estonia, LITHUANIA. When your
little finger gets extended, you must always arrive on a country that begins with one of the consecutive letters in Nlnci Sjgai, or you forgot a country.