These recommendations are divided into the following hierarchical categories describing measures that should be implemented in mail-handling/processing sites to prevent potential exposures to B. anthracis spores:

Handwritten stock lists show that imperial functionaries divided the furniture into hierarchical categories - with polished mahogany pieces considered the finest.

Barbiturates are the second hierarchical category, and individuals in this group may have been using any of the drugs in the four categories below, but not opioids.

While these categories aptly describe the divisions within education, they are not comparable to the hierarchical categories within other occupations, and thus make comparisons of levels of vertical segregation quite difficult.

GO organizes genes into hierarchical categories based on biological process, molecular function and subcellular localization.

A list alone cannot reveal much about the actual functioning of the Daijō-kan, but the broad hierarchical categories do suggest the way in which governmental functions were parsed:

They divide the Tantras into four hierarchical categories:

These relationships can be viewed as belonging to one of three main categories: preferential, hierarchical or affinitive:

These hierarchical categories should concisely describe the levels of quality (ranging from bad to good) or development (ranging from beginning to mastery).

Rowland and Schweigert propose that tangible symbols can be divided into hierarchical categories, ranging from most concrete to most abstract symbols: