FIG. 1 is a front environmental view of a illuminable house number sign showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a left side elevational view with the right side being a mirror image thereof.

The broken line showing of a side clip or clips in all Figures; house numbers in FIGS. 1 and 2; a window in FIG. 1; eye screws in FIG. 2; mounting holes for eye screws in FIG. 3; mounting holes in FIG. 5; and a photo cell and cord in FIG. 2; is for illustrative purposes only and forms no part of the claimed design.