Techniques to tag content with arbitrary labels: Tags, Labels, Flags, and Selectors.
Flags
Flags are like tags, but without the implicit requirement to document them. Like tags the values of the flags property are used for metadata-tagging.
While tags are typically rendered on the document, flags are not.
Selectors
In case you do not need to show your labels or use them for meta-tagging, then choose the naming convention "Selector" for adding additional selectors. In case you need multiple sets of selectors, add a suffix to "Selector" like "Selector Security Issues.
While tags are typically rendered on the document, selectors are not.