The ornamental design for a lamp, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
1. Lamp
1.1: is a front perspective view of a lamp showing my new design;
1.2: is a top and front perspective view thereof;
1.3: is a top perspective view thereof; and
1.4: is a bottom perspective view thereof; and
1.5: is a front and bottom perspective view thereof.
The broken lines and pattern in the design represent a pattern on the lamp and are considered part of the claimed design. The features shown in blue represent portions of the lamp that form no part of the claimed design.