The ornamental design for pizza cutter, as shown and described.
FIG. 1 is a perspective view of a pizza cutter showing my new design, the
pan shown in broken lines is for illustrative purposes only and forms no
part of the claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation thereof, the opposite side being identical;
and,
FIG. 5 is a right side elevation thereof, the opposite side being identical
.