A class of interactions partially named for these structures studied by Dougherty and Gallivan depends on inverse distance to a power less than 2. An interaction named for these structures is described by the controversial Hunter–Sanders model, which explains the effect of EWGs and EDGs on quadrupoles. That interaction named for these structures occurs in “T-shaped” and “parallel displaced” orientations. Electrons in a metal can stabilize a vacant adjacent orbital in an interaction named for these structures that commonly occurs with CO ligands. Instances of these structures have orthogonal orientations in allenes and cumulenes. Parallel instances of these structures mix in conjugated systems. (10[2])For 10 points, name these structures that arise due to the parallel overlap of p orbitals. ■END■ (10[1])