https

As an initialism https

is (internet) hypertext transfer protocol secure (http secure), an encrypted form of information transfer on the internet.

As a noun masterpiece is

a piece of work that has been given much critical praise, especially one that is considered the greatest work of a person's career.

As an initialism HTTPS

is hypertext Transfer Protocol Secure (HTTP Secure), an encrypted form of information transfer on the Internet.

As a noun celestite is

a colourless, orange or blue mineral, strontium sulfate, SrSO₄, that is an ore of strontium and constitutes the skeletons of Acantharea.

As an initialism https

is (internet) hypertext transfer protocol secure (http secure), an encrypted form of information transfer on the internet.

As an acronym pet is

(organic compound) polyethylene terephthalate.