The ornamental design of a level, as shown and described.
FIG. 1 is an isometric view of a level incorporating our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIGS. 6 and 7 are end elevation views thereof.
The article is shown with a symbolic break in its length and width. The appearance of any portion of the article between the break lines forms no part of the claimed design and the portions illustrated in phantom form no part of the claimed design.