The Japanese word "chibi" is a slang term that means "small", which is usually used to describe a shorter person or a small child. In manga and anime, it is commonplace to draw "chibi" versions of characters, which are typically drawn in an overly cute manner and often having oversized heads.
Here are the Japanese characters that can be used to write the word chibi. (Chibi is most often written in either its hiragana or katakana form.)
Kanji 禿び |
Hiragana ちび |
Katakana チビ |
Related words include chibikko (ちびっ子) meaning little kid or rug rat.