HeavisideTheta
HeavisideTheta[x] represents the Heaviside theta function θ(x), equal to 0 for x < 0 and 1 for x > 0.
HeavisideTheta[x1, x2, …]represents the multidimensional Heaviside theta function, which is 1 only if all of thexiare positive.
Examples
HeavisideTheta[1]Plot[HeavisideTheta[x], {x, -2, 2}]Please visit the official Wolfram Language Reference for more details.