1) Animal testing technique 
[animal test] The Open Field Test (OFT) is an experiment used to assay general locomotor activity levels and anxiety in rodents in scientific research. == Experimental Design == Developed by Calvin S. Hall to test emotionality of rodents, the open field test (OFT) is a commonly used qualitative and quantitative measure of general locomotor ...
any area of the playing field away from the heavily trafficked line of scrimmage, in which the defense is widely scattered. Also called