Financial ratios are relationships determined from a company's financial information and used for comparison purposes. Examples include such often referred to measures as return on investment (ROI), return on assets (ROA), and debt-to-equity, to name just three.
Tremolo harmonica. Tremolo harmonicas are a type of harmonica, distinct by having two reeds per note. In a tremolo harmonica the two reeds are tuned slightly off a reference pitch, one slightly sharp and the other slightly flat. This gives a unique wavering or warbling sound created by the two reeds being not exactly in tune with each other and difference in their subsequent waveforms acting against one another.
A gong is a percussive musical instrument, or a warning bell. The harmonica, also French harp, blues harp, and mouth organ, is a free reed wind instrument used worldwide in nearly every musical genre, notably in blues, American folk music, jazz, country, and rock and roll.