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2. Minute and second of arc - Wikipedia

   en.wikipedia.org/wiki/Minute_and_second_of_arc

   It is especially popular as a unit of measurement with shooters familiar with the imperial measurement system because 1 MOA subtends a circle with a diameter of 1.047 inches (which is often rounded to just 1 inch) at 100 yards (2.66 cm at 91 m or 2.908 cm at 100 m), a traditional distance on American target ranges.

3. Altimeter setting - Wikipedia

   en.wikipedia.org/wiki/Altimeter_setting

   QFE - is the barometric altimeter setting that causes an altimeter to read zero when at the reference datum of a particular airfield (in practice, the reference datum is either an airfield center or a runway threshold). In ISA temperature conditions the altimeter will read the height above the airfield/runway in the vicinity of the airfield.

4. Aircraft approach category - Wikipedia

   en.wikipedia.org/wiki/Aircraft_approach_category

   The International Civil Aviation Organization (ICAO) classifies aircraft by their indicated airspeed at runway threshold (V at, [1]: II-5-1-3 also known as approach speed or V REF). The categories are as follows: [1]: II-5-1-3 Category A: less than 169 km/h (91 kt) indicated airspeed (IAS)

5. Film speed - Wikipedia

   en.wikipedia.org/wiki/Film_speed

   Five criteria for the rating of emulsion speed have been used since the late 19th century, listed here by name and date, these criteria are: threshold (1880), inertia (1890), fixed density (1934), minimum useful gradient (1939) and fractional gradient (1939).

6. Pure-tone audiometry - Wikipedia

   en.wikipedia.org/wiki/Pure-tone_audiometry

   Pure-tone audiometry provides ear specific thresholds, and uses frequency specific pure tones to give place specific responses, so that the configuration of a hearing loss can be identified. As pure-tone audiometry uses both air and bone conduction audiometry, the type of loss can also be identified via the air-bone gap .

7. Audio mixing (recorded music) - Wikipedia

   en.wikipedia.org/wiki/Audio_mixing_(recorded_music)

   Limiters – Using a compression ratio of 10:1 or higher is known as limiting- instead of applying gentle reduction to audio above the threshold, limiters forcibly flatten it down, allowing no signal above the threshold. Many limiting units also have built-in compressors that reduce the amount of audio actually passing the threshold.