Santa Casa da Misericórdia de Lisboa has, as far as we know, the largest collection of exposed signs in the world. Usually accompanying children left in the wheels of the exposed, these signs are mostly composed of a ticket, that is, a textual document, usually on paper, in which the parent or someone by him recorded information about the minor, considered necessary. or useful.
Source: https://agendalx.pt/events/event/memorias-de-sao-roque-a-roda-dos-expostos/