The ornamental design for a nut, as shown and described.
FIG. 1 is an isometric view of a top, front, and right side of an ornamental design for a nut;
FIG. 2 is a front elevational view of the nut of FIG. 1;
FIG. 3 is a rear elevational view of the nut of FIG. 1;
FIG. 4 is a right side elevational view of the nut of FIG. 1;
FIG. 5 is a left side elevational view of the nut of FIG. 1;
FIG. 6 is a top plan view of the nut of FIG. 1; and,
FIG. 7 is a bottom plan view of the nut of FIG. 1.
The dash-dash-dash broken lines depict portions of the nut and form no part of the claimed design. The dash-dot-dash lines depict boundary lines and form no part of the claimed design. The nut is shown with symbolic breaks. The appearance of any portion of the article between the break lines forms no part of the claimed design.