Nut

FIG. 1 is a top, front, right isometric view of an ornamental design for a nut; FIG. 2 is a bottom, front, left isometric view of the nut of FIG. 1 ; FIG. 3 is a front elevational view of the nut of FIG. 1 ; FIG. 4 is a rear elevational view of the nut of FIG. 1 ; FIG. 5 is a right side elevational view of the nut of FIG. 1 ; FIG. 6 is a left side elevational view of the nut of FIG. 1 ; FIG. 7 is a top plan view of the nut of FIG. 1 ; and, FIG. 8 is a bottom plan view of the nut of FIG. 1 . The broken lines depict portions of the nut or environment that form no part of the claim. The dash-dot-dash lines are included to define unclaimed boundaries of the claimed design.