What term is often used to indicate a 'well' marked note in musical notation?

The term "ben marcato" specifically indicates that a note or passage should be played with an emphasis, or a slight accent, marking it clearly within the performance. This term helps performers understand that they should bring attention to the marked note, creating a distinct separation from other notes, enhancing its importance in the musical context.

In contrast, other terms presented in the choices have different meanings. "Ottava" refers to the octave, indicating that notes should be played an octave higher or lower than written. "Ritardando" pertains to a gradual decrease in tempo, and "colla" generally indicates "with" or "along with," often referring to a style of playing that is meant to blend with other instruments.

Understanding these terms is crucial for interpreting musical scores accurately, allowing performers to express the specific intentions behind the markings in the music.