A trading system is simply a group of specific rules, or parameters, that determine entry and exit points for a given equity. These points, known as signals, are often marked on a chart in real time...
The emissions system used in cars is a system which is designed to restrict the amount of pollution cars produce. Newer cars have system which prevent both Evaporative Emissions and harmful Exhaust...
An emissions control system is typically going to refer to a system that limits certain pollutants (emissions) given off by a vehicle. A catalytic converter is one example.