The final "yes" from the powers that be that puts a project into production.

Movie jargon used to describe when executives approve a particular film.

when a script and thus a film gets the final approval from, in most cases, a studio to proceed with making the project. This is usually given once a final budget is approved, though sometimes the rewrite of a script might affect this along with a certain actor or actress agreeing to be in the project.

Light in the spectrum between 530nm - 570 nm.

a signal to proceed

permission to proceed with a project or to take action; "the gave the green light for construction to begin"

a spring board for new product innovations encorporating Sunett

Signal from the coach to hit the next good pitch, or a signal to a base runner that gives the runner the authority to decide when to attempt a steal.