An anagram is a rearrangement of the letters of a word or phrase into another word or phrase, using all the letters once and only once. The best anagrams are meaningful and relate in some way to the original subject; for example, "stone age" and "stage one." There are also many remarkable examples of long anagrams. "'That's one small step for a man; one giant leap for mankind.' Neil Armstrong" becomes "An 'Eagle' lands on Earth's moon, making a first small permanent footprint".
An antonymous anagram, or antigram, has a meaning opposite to that of the subject text; for example, "within earshot" and "I won't hear this." Transposed couplets, or pairagrams, are single word anagrams that placed together create a short meaningful phrase, such as "best bets" and "lovely volley." A rare transposed triplet, or trianagram, is "discounter introduces reductions."