what is meant by the term coefficient in relation to chemical equation

2NaOH + H2SO4 ==> Na2SO4 + H2

In the above equation, the coefficient of NaOH is two (2) while the coefficient of H2SO4, Na2SO4, and H2 are one (1) each.
In a math equation, something like
2X + 3Y = 16, the coefficient of X is 2 and the coefficient of Y is 3.