Any letter you can think of can be used as a variable. They can be uppercase or lowercase. When you get into more complex math applications, you might have several variables in one equation, so your ability to use more than one variable at a time will become important.
A glitch is a short-lived fault in a system, such as a transient fault that corrects itself, making it difficult to troubleshoot. The term is particularly common in a computing and electronics industries, in circuit bending, as well as among players of video games.
choâ¢rale. 1. a hymn, esp. one with strong harmonization: a Bach chorale. 2. a group of singers specializing in singing church music; choir. Choral, short for Choralgesang, translation of Latin cantus chorÄlis choral singing; see choral ].