He wanted to make an instrument that could play a note longer than notes played on a traditional acoustic guitar.

VOA: special.2009.09.27

When an instrument--any instrument--the piano, plays a note what you hear is one fundamental pitch.

当任何乐器,比如钢琴,弹出一个音符时,你听到一个的是一个基本音高

耶鲁公开课 - 聆听音乐课程节选

In the case of the note, that object is a musical instrument.

ECONOMIST: The shape of the universe

Lorence notes that wash sale treatment depends on whether the ETF holds a basket of securities or if the ETF or exchange-traded note (ETN) is a security such as an option or debt instrument.

FORBES: Magazine Article