Spacer for a shelf support, comprising a light emitter

A set of spacers comprising a plurality of spacers, wherein each spacer is adapted to segment products on a a shelf support which extends substantially in a shelf support plane and is configured to receive articles placed on the shelf support, wherein each spacer is adapted to extend substantially perpendicularly to the shelf support plane so as to delimit areas of the shelf support where articles are to be placed, wherein each spacer comprises a light-emitter integrated in the spacer and a communication module adapted to trigger the emission of a blinking sequence by the light emitter of the spacer according to an order from a base station, wherein the blinking sequence is unique, specific to said light emitter and different from the blinking sequence(s) of the light emitter(s) of the other spacer(s) of the set of spacers, so that, for each spacer of the set of spacers, the blinking sequence of the light emitter of said spacer allows identification, by a blinking sequence identification unit configured to decode an acquired blinking sequence using a correspondence table associating each one of a plurality of blinking sequences with a respective spacer, of the spacer in which the light emitter is integrated.