The vertical bar symbol is used in math to represent the absolute value operator. Typically the symbol is used in an expression like this:
In plain language, this means take the absolute value of the value which is equal to .
To vertical bars on either side of a vector represent taking the magnitude or length of that vector
The absolute value operator returns the distance from zero on the number line of a number.
The syntax for a determinant is to vertical bars on either side of the matrix.
The conditional probability formula shows how to calculate the probability of an event B, given that another event A has already occurred.