help me to identify pi and sigma bond

Sigma bond:- Sigma bond is a a covalent bond which results from the formation of a molecular orbital by the end-to-end overlap of atomic orbitals,and is denoted by the symbol σ.Every single bond is a sigma bond.Pi bond:-Pi bond is a covalent bond which results from the formation of a molecular orbital by side-to-side overlap of atomic orbitals along a plane perpendicular to a line connecting the nuclei of the atoms,.It is denoted by the symbol π.A double bond contains 1 sigma bond and 1 pi bond.A triple bond contains 1 sigma bond and 2 pi bonds.
For example, in acetylene, H-C≡C-H, the sigma bond is formed by the head-on overlap of two sp orbitals.The pi bonds are formed by the side-on overlap of 2p orbitals.Thus it will have 1sigma and 2pi bonds,while if we take ex- of ethene molecule containing double bond ,it will have 1sigma and 1pi bond.