The ornamental design for a digitalsign, as shown and described.
1. Digital sign
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Top
1.6 : Bottom
Reproduction 1.1 is a front perspective view of the digital sign; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 is a left view thereof where the right view is a mirror image; reproduction 1.5 is a top view thereof; and reproduction 1.6 is a bottom view thereof.