Abstract: A plate mounting system which is particularly applicable for signposting purposes comprises polygon-shaped plate elements and connecting elements for interconnecting adjacent plate elements. Along the edges of the plate elements grooves or channels are formed on the backside of the plate elements. Each connecting element comprises two substantially parallelly extending elongated parts, each of which is adapted to engage with the channels of the plate elements with a frictional fit. The connecting elements further comprise transverse connecting parts extending between and interconnecting the elongated parts. In the outer wall parts of the wall parts defining the grooves or channels therebetween, cut-outs or recesses are formed. These recesses are outwardly open and may receive the connecting parts when one elongated part of a connecting element is inserted into one of the channels in one of the plate elements.