Notation	Name	Description	Status
c-15	Physical quantities	WMO No. 306 Vol I.2 Common Code-table C-15 'Physical quantiti...	deprecated
centre	WMO No. 306 Centres		stable
nil	Code Table D-1: Nil reasons	Nil-reason terms are used to provide an explanation for recor...	stable
observation-type	Observation and measurement types		stable
quantity-kind	Code Table D-2: Physical quantity kinds	WMO No. 306 Vol I.3 Common Code-table D-2, Physical quantity ...	stable
unit	Code Table C-6: List of units for TDCFs	WMO No. 306 Vol I.2 Common Code-table C-6 List of units for T...	stable