Windscreen wiper blade intended to be hinged to an actuating arm of a wiper system, this blade comprising: a member referred to as an ageing member able to change visual appearance over time; and at least one symbol (7) hidden by the ageing member, the symbol (7) becoming visible after the ageing member has changed in visual appearance, characterized in that the symbol (7) comprises at least one type of elementary pattern (70) the dimensions and/or relative layout of which code for information relating to the blade.