By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same number, no matter which circle you use to compute it. For the sake of usefulness people often need to approximate pi.
Definition and Examples of Literary Terms. The term palindrome is derived from two Greek words âpalinâ means again and âdromosâ means way or direction. It is defined as a number, a word, a sentence, a symbol or even signs that can be read forward as well as backward or in reserve order with the same effects and meanings.
Palindromes are a type of palingram called letter palingrams. A palingram is a sentence in which the letters, syllables, or words read the same backward as they do forward. The sentence, He was, was he? is a word palingram, because the words can be placed in reverse order and still read the same.