The ornamental design for a portal, as shown and described.
FIG. 1 is a side perspective view of a portal m accordance with the present invention;
FIG. 2 is a front elevation thereof;
FIG. 3 is a right side elevation, the left side being a mirror image thereof;
FIG. 4 is a rear elevation thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a top plan view thereof.
The dashed lines immediately adjacent to the claimed areas in FIG. 2 represent the boundaries of the claimed design. The dashed lines in the figures illustrate the portions of the design that form no part of the claimed design. None of the broken lines form any part of the claimed design.
The portal is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.