Security Button

FIG. 1 is a top, front, right-side perspective view of a security button; FIG. 2 is a bottom, back, left-side perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left-side view thereof; FIG. 6 is a right-side view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof. The shade lines shown on a cover of the security button indicate transparency. The dashed broken lines depict portions of the security button that form no part of the claimed design.