Definitions

1. noun

Notebook, particularly a digital one or a section of a digital document used for writing notes.

“She opened her nb to review the notes from the meeting.”

2. adverb

Notably bad, extremely bad, or of extremely poor quality.

“The movie was nb, and we left the theater early.”

3. acronym

Notation or Note (in various contexts).

“The instructor explained that nb stood for ‘notation’ in the music theory section.”