org-export-exclude-tags

org-export-exclude-tags is a variable defined in `ox.el'.
Its value is

("noexport")

Documentation:
Tags that exclude a tree from export.

All trees carrying any of these tags will be excluded from
export. This is without condition, so even subtrees inside that
carry one of the `org-export-select-tags' will be removed.

This option can also be set with the EXCLUDE_TAGS keyword.

You can customize this variable.