Terminology: Pagraph subject identification prefix text Reference books, technical manuals, MIL standards, etc., prefix every paragraph with a short subject identification statement. For example, paragraph 1.3 in the 16th ed. of the Chicago Manual of Style (CMoS) begins,


  1.3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rectos and versos.  Publishers refer to the ...


Is there a common terminology for the bolded and italicized (in this case) subject identification prefix text? What is this writing practice called? In particular, does the CMoS define this practice (I've looked extensively in the CMoS but I couldn't find anything).

(FWIW, the MIL standards I checked typically identify this text as "paragraph identification", "subject identification," or "paragraph and subparagraph identifications". But I can't find in other style guides a description for this paragraph summary text.)
In my experience, this is just called the (sub)section name --- as driven by the LaTeX styling used in many STEM disciplines.  No fancier title is needed.