1. A sign, signal, or indicator that is not immediately visible or obvious; a concealed or covert message or indication
The detective noticed a hidden sign in the suspect's behavior.
O detetive notou um sinal oculto no comportamento do suspeito.
2. In computing and design, a hidden or non-obvious user interface element or functionality
The software contained hidden signs of malware in its code.
O software continha sinais ocultos de malware em seu código.