Which of the following is NOT a note duration mentioned in the context?

In the context of musical note durations, a whole note, quarter note, and half note are all standard terms used to describe specific lengths of time a note is held. A whole note lasts for four beats, a half note lasts for two beats, and a quarter note lasts for one beat. These terms are fundamental in understanding rhythm and timing in music composition.

On the other hand, "triple note" is not a recognized term for a note duration. This term does not correspond to any conventional note length in music notation. Therefore, it's the option that stands out as not fitting within the established categories of note durations, making it the correct answer to the question posed.