with reference to fig4 to 7 the system of the rib shapes can be clarified for example fig4 shows a reinforcing rod 41 with a rib 42 of first order and a recess 43 with a rib depth t 42 a flank inclination angle u03b1 a pitch t 42 which is the combination of the rib width b 42 plus the distance b 42 between two adjacent ribs in fig5 now for a reinforcing rod 51 of a rib corresponding to the rib 42 of first order from fig4 and also a recess corresponding to the recess 43 from fig4 a narrower rib 52 of second order and also narrower recesses 53 are superimposed which form together with the rib of first order an order system made from narrow ribs of higher order 52 54 55 56 and a wide rib 57 of lower order which carries the narrow ribs it is not difficult to see that in a loaded case the narrow ribs shear off more quickly and that however when they are sheared off the wide rib 57 still creates a bond with the concrete surrounding the reinforcing rod and thus the rod 51 does not fail suddenly at the same time in all anchoring sections fig6 and fig7 finally show for reinforcing rods 61 71 multiple step ribs 62 72 which are likewise the result of superimposing several ribs wherein the rib sub regions 62 a 62 b 62 c have different flank inclinations u03b1 0 u03b1 1 u03b1 2.