A capital "F" immediately following the number in question. For examples: +36F or -20F.
I think it is just F
The abbreviation for Celsius is °C and for Fahrenheit is °F.
no
ºF = degrees Fahrenheit
°F
F
The proper abbreviation for extension is "ext."
The proper abbreviation for kilohertz is kHz.
The proper abbreviation for Sunday is Sun.
The proper abbreviation for Registered Chemist is RCh.
The proper abbreviation title for an attorney is "Esq."
There is no proper abbreviation for the word global. It is often symbolized by a letter G in acronyms. As far as an abbreviation goes, many people use Gl., but this is in no way a proper abbreviation.