This project deals with the handwritten letters in walls and public spaces, focusing on graffiti and pichação as forms of expression that interact with pedestrians within the urban territory. From the field of design and art, addressing an urban manifestation considered marginal as an object of investigation, is a way to deepen this practice as an accessible and effective communication platform in the streets of the city, which does not cease to exist in spite of the technological advances. Then, we propose the classification of styles letters in graffiti and pichação found on predetermined areas at Rio de Janeiro. As well, a panoramic view from different viewpoints, such as the one who executes (graffiti makers and pichadores), the one of who observes (passers-by and interns) and the one who takes care of the territory (legislation and government entities). Thus, we highlight the value of this as a manifestation within popular culture, also, as part of the Brazilian urban graphic, and the importance of its registration as a contribution to the history of written communication, in Brazil and in Latin America. Documenting the found letters on the city walls from an ephemeral and persistent way at the same time, created a path not only to uplifting its diversity, but also to understand how they dialogue with the population. In a present moment in which graffiti and pichação are between the fight for the conquest of the street, the defense of the free expression in front of the public organs and the acceptance like part of the scene of transformation and renovation of public spaces.