nominal reference material

https://doi.org/10.1351/goldbook.10020

Material, sufficiently homogeneous and stable with reference to a specified nominal property, that has been established to be fit for its intended use in an examination.

Examples:
  1. Colour chart with one or more specified colours.
  2. DNA compound containing a specified nucleotide sequence.
Note: Nominal reference materials with or without assigned reference nominal property values can be used for control of examination precision, whereas only nominal reference materials with assigned reference nominal property values can be used for the control of examination calibration or evaluation of examination trueness.
Source:
PAC, 2018, 90, 913. 'Vocabulary on nominal property, examination, and related concepts for clinical laboratory sciences (IFCC-IUPAC Recommendations 2017)' on page 929 (https://doi.org/10.1515/pac-2011-0613)