"In virology, a spike protein or peplomer protein is a protein that forms a large structure known as a spike or peplomer projecting from the surface of an enveloped virus"
https://en.wikipedia.org/wiki/Spike_protein
"The spike protein of coronaviruses is one such viral glycoprotein. Ebola viruses have one, the influenza virus has two, and herpes simplex virus has five."
https://phys.org/news/2020-12-coronavirus-variant-spike-protein-mutations.html
"A major target for potential HIV vaccines is a spike-shaped virus protein known as Env. Env extends from the surface of the HIV virus particle."
https://www.nih.gov/news-events/nih-research-matters/structure-dynamics-hiv-surface-spikes
