What is "zil-e-huma"

Zil-e-Huma ( Punjabi, ; 21 February 1944 – 16 May 2014) was a Pakistani singer. Born to Jehan-Rizvi family, she was the youngest daughter of Noor Jehan and Syed Shaukat Hussain Rizvi from Noor Jehan's first marriage. Noor Jehan and Shaukat Hussain Rizvi together also had 2 older sons named Akbar Rizvi and Asghar Rizvi.