Similar to the character limiter plugin, but for multibyte characters saved as entities in the database.
Has this ever happened to you?
You have some text in a language that uses multibyte characters (for example, Japanese), but using word/character trimming plugins give you garbled text, especially near the last character. Your foreign characters are probably saved in the database as ASCII entities, and those characters are being trimmed instead.
The NB moji limit plugin allows you to trim foreign language characters correctly, without garbled text (known as mojibake in Japanese).