FIG. 1 is a front elevational view of the foldable stool in an open position showing my design;
FIG. 2 is a rear elevational view in an open position;
FIG. 3 is a right side elevational view an open position;
FIG. 4 is a left side elevational view an open position;
FIG. 5 is a top plan view in an open position;
FIG. 6 is a bottom plan view in an open position;
FIG. 7 is a front perspective view in an open position;
FIG. 8 is a top plan view in a folded position;
FIG. 9 is a bottom plan view in a folded position;
FIG. 10 is a left side elevational view in a folded position;
FIG. 11 is a right side elevational view in a folded position;
FIG. 12 is a front elevational view in a folded position;
FIG. 13 is a rear elevational view in a folded position; and,
FIG. 14 is a front perspective view in a folded position.
The broken lines shown in FIG. 6 depict portions of the foldable stool that form no part of the claimed design.