What are the key features of the Indus Valley Civilization I must remember for UPSC?

Key features of the Indus Valley Civilization include advanced grid-based town planning, standardized burnt bricks, and a sophisticated covered drainage system.
Notable for its maritime trade with Mesopotamia and the world's first dockyard at Lothal, it prioritized civic hygiene over grand monuments.
Focus on religious symbols like the Pashupati Seal, artistic artifacts like the Dancing Girl, and their unique, undeciphered Boustrophedon script.