Abstract: The panel sign includes one post in the case of a "flag" type sign and two posts for a panel sign supported at opposite ends, together with a generally rectangular panel member. Each post constitutes an extruded member having an elongated vertical slot communicating with a hollow interior. The panel has an edge flange of T-shape receivable in the slot for lateral support by the post. An extruded filler element in turn has a forward portion arranged to fill the slot when the element is inserted in the hollow interior of the post. This element is cut to a length corresponding to the position of the lower end of the panel edge flange and the bottom of the post so that when inserted in the post, it serves to finish off the appearance of the post; that is, it renders the remaining slot portions substantially invisible. A small additional filler element is receivable in the top portion of the post to fill a top exposed portion of the slot where the edge flange of the panel falls below the top of the post.