Why is the Indus civilization also called the Harappan civilization?

The Indus civilization is also referred to as the Harappan civilization because Harappa was the first site where the civilization was identified, following excavations that began in 1921.12

Archaeologists often use the term "Harappan" to describe the culture because the remarkable uniformity of artifacts found across its various settlements provides a distinct hallmark for identifying the civilization's sites. While the civilization is also known for its other major city, Mohenjo-daro, the designation "Harappan" serves as a standard archaeological reference for the entire cultural complex.312