Hand Seal

Hand seals, called hand signs in the English dubbed version, are used to create many ninjutsu, genjutsu, and other secret arts other than taijutsu. There are different sequences of hand signs for every technique, requiring memorization. While techniques may require a number of hand signs to work, a skilled ninja can use less or even one to perform the same technique. An example of this is the Water Release: Water Dragon Blast Technique, which requires a total of 44 hand signs to activate. The Second Hokage however just needed to use one hand sign to complete the technique, a testament to his skill.

Besides the 12 traditional hand seals, each named after an animal of the Chinese zodiac, there are unique hand seals used for few techniques. These hand seals are rarely seen, and can be considered unique to specific jutsu. An example of such is Haku's Demonic Ice Crystal Mirrors.

Trivia

 * Rat is often used in the Nara Clan's Shadow Jutsus
 * Tiger is often used in Fire Release jutsus
 * Snake is often used in Earth Release jutsus and in Mokuton
 * Dog is often used in Hyoton aka Ice Release