Here is a list of all documented namespace variables with links to the namespaces they belong to:

_debug_level : nestedsums
_empty_list : nestedsums
_empty_list_of_tgamma : nestedsums
_nestedsums_evaluation_veto : nestedsums
_nestedsums_evaluation_veto_type_A : nestedsums
_nestedsums_evaluation_veto_type_B : nestedsums
_nestedsums_evaluation_veto_type_C : nestedsums
_nestedsums_evaluation_veto_type_D : nestedsums
_unit_one_letter : nestedsums
_unit_zero_letter : nestedsums
nestedsums_version_major : nestedsums