Aperture Science™

Aperture™ : Science Laboratories

Aperture Science, Inc. is a United States-based scientific research corporation appearing in Portal and Portal 2, as well as other sources.

Its main facility is the Aperture Science Enrichment Center, located in Upper Michigan, with at least one other base of operations in Cleveland, Ohio. it evolved over the course of half a century into an experimental physics research institution and a bitter rival of Black Mesa.

Aperture Laboratories is also used as a trade name by Aperture Science for most of its products, as Aperture Science dba Aperture Laboratories. Aperture Science Innovators was the brand used before the 1970s.

aperture information[half-life.wikia.com]
Portal-Portal 2