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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.
The Greek letter sigma is used to denote a selection operation: select * from foo where bar = 10;
In mathematics, the letter n is used to denote an integer (whole number) whose value can be varied.
radio wave
The abbreviation lb denotes pounds (in weight), from the Latin libra.The letter t is used to denote weights in tons/tonnes.
Q stands for quotient. The letter R was already used for the set of Real numbers.
Ellipses are used to show an omission of text. In a personal letter, business letter, academic paper, quotation, etc., it will always denote some kind of omission.