Today a number of abstract examples following certain conventions are occasionally used for names, primarily for corporate logos or product logos and incorporating some characters of the name, as in a …

Ditloid A ditloid is a type of word puzzle [1] in which a phrase, quotation, date, or fact must be deduced from the numbers and abbreviated letters in the clue. An example would be "7 D S" representing …

A riddle is a statement, question, or phrase having a double or veiled meaning, put forth as a puzzle to be solved. Riddles are of two types: enigmas, which are problems generally expressed in …

A balance puzzle or weighing puzzle is a logic puzzle about balancing items—often coins—to determine which one has different weight than the rest, by using balance scales a limited number of …

Frege's puzzles are puzzles about the semantics of proper names, although related puzzles also arise in the case of indexicals. Gottlob Frege (1848–1925) introduced the puzzle at the beginning of his …

Echoplex EP-2 The Echoplex is a tape delay effects unit, first made in 1959. Designed by engineer Mike Battle, [1] the Echoplex set a standard for the effect in the 1960s; according to Michael Dregni, …

Word ladder[a] is a word game invented by Lewis Carroll. [3] A word ladder puzzle begins with two words, and to solve the puzzle one must find a chain of other words to link the two, in which two …

Martin Gardner was born into a prosperous family in Tulsa, Oklahoma, to James Henry Gardner, a petroleum geologist, [20] and his wife, Willie Wilkerson Spiers, a Montessori-trained teacher. His …