Musical instruments that start with the letter I include the igil, ipu, Irish uillean, Irish bouzouki, ichigenkin, inci, iya, itotele and istarski mih. The instruments originate from countries ranging from Cuba and Ireland to Croatia, Japan and the Philippines.
Bessel's functions are often used in acoustics for describing circular membranes behaviour (exploited by most of the musical instruments). They are the solutions of the wave equations using polar coordinates. Set the properties of the membrane Bessel's functions describe the vibrational modes of the membrane.
Gold Tassels for Graduate Honors. Graduation tassels are an essential component for any student commencement exercises. The tassel is worn by wrapping the upper loop around the button on a traditional graduation cap, and allowing the tassel to hang over the front left side of the cap.