The ornamental design for a scribeslot for a rafter angle square, as shown and described.
FIG. 1 is an isometric view of a scribe slot for a rafter angle square incorporating my new design, wherein the portions shown in phantom illustrate environment and form no part of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,