  Unconventional fermions in the immensely studied topological semimetals are
the source for rich exotic topological properties. Here, using symmetry
analysis and first-principles calculations, we propose the coexistence of
multiple topological nodal structure in LaSb2, including topological nodal
surfaces, nodal lines and in particular eightfold degenerate nodal points,
which have been scarcely observed in a single material. Further, utilizing high
resolution angle-resolved photoemission spectroscopy in combination with
Shubnikov-de Haas quantum oscillations measurements, we confirm the existence
of nodal surfaces and eightfold degenerate nodal points in LaSb2, and extract
the {\pi} Berry phase proving the non-trivial electronic band structure
topology therein. The intriguing multiple topological nodal structure might
play a crucial role in giving rise to the large linear magnetoresistance. Our
work renews the insights into the exotic topological phenomena in LaSb2 and its
analogous.

Strongly Correlated Electrons;Materials Science