There are also word-unit palindromes in which the unit of reversal is the word ("Is it crazy how saying sentences backwards creates backwards sentences saying how crazy it is? Word-unit palindromes were made popular in the recreational linguistics community by J. Several in French and Latin date to the Middle Ages.
Semordnilap (palindromes spelled backward) is a name coined for words that spell a different word in reverse.
The word was coined by Martin Gardner in his notes to C. Bombaugh's book Oddities and Curiosities of Words and Literature. An example of this is the word stressed, which is desserts spelled backward.
If a number is not a Lychrel number, it is called a "delayed palindrome" (56 has a delay of 1 and 59 has a delay of 3).
In January 2017 the number 1,999,291,987,030,606,810 was published in OEIS as A281509, and described as "The Largest Known Most Delayed Palindrome", with a delay of 261. The third movement, minuet and trio is a musical palindrome.
Owl ate my metal worm", "Was it a car or a cat I saw? Punctuation, capitalization, and spaces are usually ignored.
Some, such as "Rats live on no evil star", "Live on time, emit no evil", and "Step on no pets", include the spaces.
A palindromic prime is a palindromic number that is a prime number, for example, 191 and 313.
The continued fraction of ⌋ is a repeating palindrome when n is an integer, where essentially, for any positive x, ⌊x⌋ denotes the integer part of x.
Some names are palindromes, such as the given names Hannah, Ada, Anna, Bob, Nitin and Otto, or the surnames Harrah, Renner and Salas. Lon Nol (1913–1985) was Prime Minister of Cambodia.
Nisio Isin is a Japanese novelist and manga writer, whose pseudonym (西尾 維新, Nishio Ishin) is a palindrome when romanized using the Kunrei-shiki or the Nihon-shiki systems, and is often written as Nisi Oisi N to emphasize this.
Hence, it can be arranged into a word square that reads in four different ways: horizontally or vertically from either top left to bottom right or bottom right to top left. The palindromic Latin riddle "In girum imus nocte et consumimur igni" ("we go wandering at night and are consumed by fire") describes the behavior of moths.