Characters that appear in front of variables are often; either a constant (any designated number) which is often called a coefficient, a different variable, or an operator such as an integrand or derivative.
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We call a number that has no variable attached to it, a constant. A number attached to a variable, as in 3x, is called a coefficient.
Constant
The number in front of the variable is called the coefficient
constant
Possibly, a "constant term".