Low-magnetic-field scanning tunneling spectroscopy of individual Abrikosov vortices in heavily overdoped Bi2Sr2CaCu2O8+δ unveils a clear d-wave electronic structure of the vortex core, with a zero-bias conductance peak at the vortex center that splits with increasing distance from the core. We show that previously reported unconventional electronic structures, including the low-energy checkerboard charge order in the vortex halo and the absence of a zero-bias conductance peak at the vortex center, are direct consequences of short intervortex distance and consequent vortex-vortex interactions prevailing in earlier experiments.Received 16 February 2021Revised 29 April 2021Accepted 17 June 2021DOI:https://doi.org/10.1103/PhysRevX.11.031040Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasLocal density of statesVortices in superconductorsd-wavePhysical SystemsHigh-temperature superconductorsTechniquesScanning tunneling microscopyScanning tunneling spectroscopyCondensed Matter, Materials & Applied Physics