Electrode

FIG. 1 is a top front isometric view of an electrode showing the claimed design; FIG. 2 is a bottom rear isometric view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a right side elevation view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The broken lines, the areas within them, and the unshaded areas bounded by broken lines and solid lines in the figures show portions of the electrode that form no part of the claimed design.