In international radio communication, the letter W is denoted by the word "Whiskey." This is part of the NATO phonetic alphabet, which is used to ensure clarity and avoid misunderstandings when communicating letters over radio or telephone transmissions.
Whiskey
Bravo
Psi is used to denote diverse phenomena, paranormal phenomena, the unexplained, etc..
Capital sigma.
If the line is horizontal, it is the greek letter theta, often used to label an angle. If the line is diagonal, it is used to denote the diagonal of a circle. As the greek letter phi it is used to denote an empty set and also used to label an angle.
It is the Greek letter phi. This browser will not allow me to show it.
radio wave
The letter representing the star Betelgeuse is "α", which is the Greek letter alpha. It is used in the Bayer designation system to denote the brightest star in the constellation of Orion.
The Greek letter sigma is used to denote a selection operation: select * from foo where bar = 10;
The symbol used to represent seconds is "s." This abbreviation is part of the International System of Units (SI) and is commonly used in scientific and everyday contexts to denote time.
In mathematics, the letter n is used to denote an integer (whole number) whose value can be varied.
The symbol commonly used to denote entropy is S.