Display screen or portion thereof with icon

The patent file contains at least one drawing executed in color. Copies of the patent file with color drawing(s) will be provided by the Patent Office upon request and payment of the necessary fee. Color forms no part of the embodiments of the design shown in FIGS. 1 and 3 .

FIG. 1 is a front view of a display screen or portion thereof with icon showing our new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof; and,

FIG. 4 is a front view of a fourth embodiment thereof.

The dot-dash line representations of the display screen or portion thereof in the figures form no part of the claimed design.

Example devices having display screens on which the various icons of the claimed design may be provided include one or more of computers, tablets, smart phones, control interfaces, gauges and measurement instuments. The various icons of the claimed design are not limited to the placement on a display screen or portion thereof as shown in the figures.