The Progressive Era. During the period known as the Progressive Era (1890s to about 1920) the U.S. government became increasingly activist in both domestic and foreign policy.
One possible link between brain freeze and other headaches is local changes in brain blood flow. If further research confirms all these types of headaches are caused by blood flow changes, new drugs that block widening of the blood vessels - called vasodilation - could improve treatment for sufferers.
Now that the smart-ass answer has been given, let me actualy respond. A IT Operations Freeze - which is what you are after - is a senior management decisions to STOP, HALT, or CEASE any normal change implementations to your Produciton environment. The purpose is usually business oriented and is of a short duration. The reasoning can be varied For example