Oop's thanks for pointing that out ,I'll just call It a type "o"
Also just for Interest.
'Q' CODE FOR ALTIMETER SETTING
The setting of altimeters to the barometric pressures prevailing at various flight levels and airfields is part of flight operating techniques, and is essential for maintaining adequate separation between aircraft, and terrain clearance during take-off and landing. In order to make the settings a pilot is dependent on observed meteorological data that are requested and transmitted from ground control centres. The requests and transmissions are adopted universally and form part of the ICAO 'Q' code of communication. Three code letter groups are normally used in connection with altimeter settings, and are defined as follows:
QFE
Setting the pressure prevailing at an airfield to make the altimeter read zero on landing and take-off.
When set to QFE (the atmospheric pressure at the level of an aerodrome reference point) the altimeter will indicate height above the reference point. If the aircraft is standing at the reference point, the altimeter will indicate zero.
QNE
Setting the standard sea-level pressure of 1013.25 mbar (29.92 in Hg) to make the altimeter read the airfield elevation. The altimeter then indicates the flight level of the aircraft. This setting is the correct one to use when obtaining TAS from the computer.
When set to 1013.25 mb the accepted constant average value of mean sea-level pressure throughout the world, it will indicate flight level. An aircraft maintaining a flight level with its altimeter set to 1013.25 mb will fly along a surface of constant atmospheric pressure.
The aircraft’s vertical distance from mean sea-level at various places enroute may vary, due to changes in the atmospheric pressure enroute in horizontal planes. Example: an aircraft flying towards a low pressure area will fly progressively lower while still maintaining the same flight level.
QNH
Setting the pressure scale to make the altimeter read airfield height above sea-level on landing and take-off.
