org-export-current-backend

org-export-current-backend is a variable defined in `ox.el'.
Its value is

nil

Documentation:
Name, if any, of the back-end used during an export process.

Its value is a symbol such as `html', `latex', `ascii', or nil if
the back-end is anonymous (see `org-export-create-backend') or if
there is no export process in progress.

It can be used to teach Babel blocks how to act differently
according to the back-end used.