The full form of CUBIC is CUBIC

CUBIC is a network congestion avoidance algorithm for TCP which can achieve high bandwidth connections over networks more quickly and reliably in the face of high latency than earlier algorithms. It helps optimize long fat networks.

CUBIC TCP is implemented and used by default in Linux kernels 2.6.19 and above starting in 2006.

MacOS adopted CUBIC by at least the OS X Yosemite release in 2014.

Microsoft adopted it by default in Windows 10.1709 Fall Creators Update (2017), and Windows Server 2016 1709 update

Cubic Corporation is an American public corporation providing diversified systems and services to the transportation and defense markets worldwide via two business segments, Cubic Transportation Systems and Cubic Mission and Performance Solutions, respectively.