QNH and QFE are ICAO terms for altimeter settings.  (which have previously been explained).  They are both certainly not obsolete and used world wide today.



<<< An obsolete term you  still see now and then is QFE which setting the altimeter to zero at the field elevation to know your elevation above the ground directly with no mental math.  Probably used during training on flat ground long, long ago.   >>>

 
QFE is still used by many in the soaring community.
 
Robert M. Simon
ES-P N301ES