Ordinal scale
Abbreviation  None 

Synonym  None 
Definition  Quantity, defined by a conventional measurement procedure for which a total ordering relation can be established, according to magnitude, with other quantities of the same kind, but for which no algebraic operations among those quantities exist 
Scope  An ordinal scale serves for the comparison of examined values regarding a kindofproperty that can be ordered by magnitude. 
Description 
Quantities with results that are expressed in an ordered rank. A given result can be “lower” or “greater” than another result for the same quantity. If results are given as numerical values, they cannot be added, subtracted, divided or multiplied. The difference between two values is not the same between the numerical values. Note 1: Ordinal scale is attributed to NPU codes with arbitrary kindsofquantity. Note 2: Results have no ISQ dimensions or SI units 
Value set 
The results are presented with alphabetic letters or numerical values in a hierarchal way. Results with numbers{0<1<2<3}. Results with alphabetic letters{none<little<much<very much}. {no<yes}. 
Reference 

 arbitrary activity
 arbitrary amountofsubstance
 arbitrary concentration
 arbitrary catalytic activity
 arbitrary catalyticactivity concentration
 arbitrary content
 arbitrary entitic amountofsubstance
 arbitrary entitic number
 arbitrary fraction
 arbitrary number
 arbitrary number concentration
 arbitrary number fraction
 arbitrary rate
 arbitrary threshold concentration
 arbitrary time
 arbitrary viscosity
 compatibility
 expiry
 motility
 presence