Gyeongseong is the Korean form of Keijō (京城), the former Japanese name of Seoul used during the Japanese Colonial Period (1910-1945).
Seoul was called Hanseong until 1910, but the city's main railway station opened with the name "Gyeongseong Station" in 1900, which name it retained until 1905. It was called Gyeongseong Station again from 1915 to 1947, when it assumed its current name.
Gyeong (경; 京) means "capital" and seong (성; 城) refers to Hanseong (한성; 漢城), the name of Seoul during the Joseon Dynasty (as mentioned above). The name survives today in the names of various railway lines and freeways, including:
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