Panel and fastening system for such panel

A locking element for use in a hook connection of rectangular, tabular panels, in order to prevent, in a hooked state of two panels, release of the hook connection in a direction perpendicular to a plane of the hooked panels, said panels having corresponding hook elements on opposite small faces of each panel, wherein it is possible to make the hook connection with the corresponding hook elements of two similar panels, said locking element comprising:

• a resilient snap tab,
• wherein in a pre-mounted state, the locking element, in cross-section, has a first leg perpendicular to a panel plane and a second leg perpendicular to a small face, the second leg intended to be mounted into a groove of the small face, the groove in the small face and substantially perpendicular to the small face and the second leg attached to one end of the first leg, the second leg substantially perpendicular to the first leg and the resilient snap tab attached to the other end of the first leg;
• and
• wherein, in a relaxed state of the resilient snap tab, the resilient snap tab extends inclined, outwardly from the small face such that the resilient snap tab projects at an oblique angle from the small face of the panel, and the resilient snap tab is changed in such a way that the resilient snap tab is resiliently bent towards the first leg and the locking element is shortened perpendicular to the small face during making of the hook connection in order to enable hooking of the hook elements.