Pitot and AOA sensor.

Hello again, this is a picture of Pitot probe and the AOA (angle of attack) sensor fitted to a Boeing 767-200 aircraft. A quick description on the Pitot Static system,

Aircraft constantly encounter atmosphere pressure changes as they climb, descend, accelerate or decelerate. The pitot-static system - sensitive to airspeed, altitude, and rates of altitude change - provides the pressure information displayed on cabin instrumentation.

An outside air temperature sensor must be installed for air data systems.

The airspeed indicator is vented to both pitot and static lines. The airspeed indicator reacts to changes between pitot air and static air. The altimeter and vertical speed indicator, however, require venting to only the static line (see Venting of a Pitot-Static System above). The system shown employs a heated pitot tube to prevent ice formation, a necessary feature for flight in instrument conditions.

click here for description of a basic Pitot/Static system.
http://www.allstar.fiu.edu/aero/PSSI.htm