The number "280" on its own does not have a specific widely recognized meaning in Denver. However, the number "5280" is famously associated with Denver as it represents the city's elevation of exactly one mile above sea level—5,280 feet. Denver is often called the "Mile High City" and this number is prominently used in local sports (such as the Denver Nuggets and Denver Broncos), culture, and identity as a symbol of the city's unique geography and pride.
If you meant "280" as a separate number or term in Denver, it does not have the same known significance as "5280." If you have more context or specific usage for "280," that could help clarify further.
