Experts say it's possible that it could eventually receive a Greek letter, but it’s unlikely to be dubbed SARS-CoV-3 any time soon.

Source: https://www.salon.com/2023/12/23/a-new-variant-is-now-dominant-in-the-us-will-it-cause-another-massive-surge-like-omicron/

The earliest known use of the Greek letter π to represent the ratio of a circle’s circumference to its diameter was by mathematician William Jones in his 1706 work Synopsis Palmariorum Matheseos; or, a New Introduction to the Mathematics.

Source: https://greekreporter.com/2023/03/14/pi-day-math/

The World Health Organization has declined to assign a Greek letter to new COVID variants since omicron, saying that they don’t differ enough to warrant the designation.

Source: https://fortune.com/well/2023/06/16/covid-vaccine-booster-variant-omicron-gryphon-fda/

This acceleration appears to be driven by the repulsive energy of space itself—so-called dark energy, which is represented by the Greek letter Λ (pronounced “lambda”).

Source: https://www.wired.com/story/no-the-james-webb-space-telescope-hasnt-broken-cosmology/