information on this convention.
``__*__``
- System-defined names. These names are defined by the interpreter and its
- implementation (including the standard library). Current system names are
- discussed in the :ref:`specialnames` section and elsewhere. More will likely
- be defined in future versions of Python. *Any* use of ``__*__`` names, in
- any context, that does not follow explicitly documented use, is subject to
+ System-defined names, informally known as "dunder" names. These names are
+ defined by the interpreter and its implementation (including the standard library).
+ Current system names are discussed in the :ref:`specialnames` section and elsewhere.
+ More will likely be defined in future versions of Python. *Any* use of ``__*__`` names,
+ in any context, that does not follow explicitly documented use, is subject to
breakage without warning.
``__*``