smaller modular tiles so that it is possible to lay out a flooring with integrated markings of lines letters figures or symbols application_number US 14616893 A description the tile 2 shown in fig1 and 3 is diecast and has a top layer 4 in which as well known there is provided holes 6 with the areas between these holes 6 having depending floor supported cylindrical carrier portions 8 and with the tile having correspondingly depending edge walls 10 in these walls a number of slots 12 and provided in a uniform manner along each of the edges walls 10 with these slots 12 being downwardly open and extending only over a lower part of the height of the edge wall 10 behind each of the slots 12 there is arranged confined by rib portions 14 depending from the top side 4 a downwardly open channel 16 which is somewhat broader than the slot 12 and extends upwardly beyond the upper end of the slot 12 to the tiles belong coupling members 18 as shown in fig2 with the coupling members 18 being adapted to be brought into engagement with the inner side of the edge wall 10 behind the slot 12 in a manner such that the coupling member can hold together two adjoining tiles 2 the coupling members 18 have a middle beam portion 20 the length of which is approximately twice the thickness of the edge wall adjacent the slots 12 and opposed wider head portions 22 which are both broader and upwardly higher than the beam portion 20 these head portions 22 are provided with interfacing parallel inner sides 24 while at their upper ends they are preferably.