org-drawers

org-drawers is a variable defined in `org.el'.
Its value is

("PROPERTIES" "CLOCK" "LOGBOOK" "RESULTS")

Documentation:
Names of drawers. Drawers are not opened by cycling on the headline above.
Drawers only open with a TAB on the drawer line itself. A drawer looks like
this:
:DRAWERNAME:
.....
:END:
The drawer "PROPERTIES" is special for capturing properties through
the property API.

Drawers can be defined on the per-file basis with a line like:

#+DRAWERS: HIDDEN STATE PROPERTIES

You can customize this variable.