An absolutive flag is a °flag that is used with an °S- and °P-argument, but cannot be used with an °A-argument.
Most languages lack a flag for the absolutive relation, but the relation is still formulated in terms of "absolutive flag".
absolutive category (STR) = the category in the ergative alignment strategy that co-expresses both S and P roles. Example: Yuwaalaraay argument phrases use the same zero flag to express the S and P roles, and hence this is an absolutive flag. (Section 6.3.1)