What architectural feature became McDonald's most famous logo symbol in the 1960s?

The architectural feature that became McDonald's most famous logo symbol in the 1960s was the Golden Arches.

The arches originated as physical architectural elements on McDonald's restaurant buildings. Architect Stanley Clark Meston designed the original drive-in restaurant layout in San Bernardino, California, with large yellow arches incorporated into the structure.

The arches were initially intended to make the restaurants visible to passing motorists. Over time, the two arches were combined into the familiar “M” shape and became a standalone corporate symbol.

The Golden Arches are often confused with the entire McDonald's logo, but the term specifically refers to the arch design. Their use helped create a recognizable visual identity that could be seen from roads and later reproduced on signs, packaging, advertising, and storefronts.