三沙

Noun

 * 1)  subsubcontractor

Etymology 2
A single island (not three), variously explained as having formed three times or as having been initially settled by the Zhu, Zhang , and Chen families.

Proper noun

 * 1)  Sansha a former island of the Yangtze estuary now forming part of Chongming Island

Etymology 3
From its three component areas of, , and.