The names Δ and δ may refer to any of several distinct mathematical quantities.

For partial differentiation, see diff.

For the Dirac delta function, see Dirac.

For the Kronecker delta tensor in physics, see Physics[KroneckerDelta].

For the Kronecker delta tensor in differential geometry, see DifferentialGeometry[Tensor][KroneckerDelta].

For the Delta polynomial in differential algebra, see DifferentialAlgebra[Tools][DeltaPolynomial].

For the risk measure Delta under the Black-Scholes model, see Finance[BlackScholesDelta].

$\mathrm{diff}\left(f\left(x\,y\right)\,x\right)$

$\frac{\partial }{\partial x}f\left(x\,y\right)$

$\mathrm{int}\left(\mathrm{Dirac}\left(x\right)f\left(x\right)\,x=-\mathrm{\infty }..\mathrm{\infty }\right)$

$f\left(0\right)$