-Format a tradename.
-.Pp
-Since this macro is often implemented to use a small caps font,
-it has historically been used for acronyms (like ASCII) as well.
-Such usage is not recommended because it would use the same macro
-sometimes for semantical annotation, sometimes for physical formatting.
-.Pp
-Examples:
-.Dl \&.Tn IBM
+Supported only for compatibility, do not use this in new manuals.
+Even though the macro name
+.Pq Dq tradename
+suggests a semantic function, historic usage is inconsistent, mostly
+using it as a presentation-level macro to request a small caps font.