The vast majority of viruses are categorized based on their capsid architecture into two primary types of symmetry: cuboid (also known as icosahedral or isometric) and helical.

Cuboid (Icosahedral) Symmetry: This is the most prevalent symmetry. An icosahedron is a geometric shape with 20 equilateral triangular faces and 12 vertices. Examples include Adenovirus, Poliovirus, and Herpesviruses.

Helical Symmetry: Capsid proteins wind around the viral nucleic acid in a spiral or rod-like fashion. Examples include Tobacco Mosaic Virus (TMV), Influenza, and Ebola.

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