A fundamental component used to categorize kanji characters, often representing a common theme or concept that contributes to the character's meaning.

The shared part of kanji that serves as a reference point for organizing characters in dictionaries, including elements like prefixes, suffixes, and other structural features.

A label assigned to specific radicals within kanji that assists in the classification and structure of characters, sometimes referred to by specific names, such as mountain部 (yama-bu) or fish部 (uo-bu).

The basic building block of kanji used to group characters with similar meanings, which can be found in various written forms, including dictionaries and educational texts.