Is there a barometric measurement beginning with Q?

[Arabesque]

[redman41]

http://www.skybrary.a...ter_Pressure_Settings

[Clanad]

Adding to redman's link, there's also 'QNE': The standard altimeter setting of 29.92 inches of mercury (the contraction is Hg.), or 1013.25 hectopascal (hPa for short), or 1013.25 millibars (use mb). Aircraft that fly above 18,000 feet above mean sea level (MSL) switch their altimeter settings from local references to 29.92 "Hg so all altimeters will read the same. This is especially relevant now that aircraft in cruise above 29,000 feet MSL are only separated by 1,000 feet rather than the previous 2,000 feet...

The origins of using "Q" as the abbreviation for altimeter settings apparently began in WWII when such codes were transmitted via Morse Code. There's no reliable historical evidence, however, that explains why "Q" was chosen in the first place...

[dundurn]

Q codes were introduced in the early days of radio communication (very often Morse code rather than voice). Q triplet codes were intended as Query/response messages. Their use was formalised as early as 1912.

[gen2]

We used to use QFE and QFF when I worked as a Meteorological observer - but that was many moons ago.