The sign is one of a series of signs that were placed around Lisbon on the 125th anniversary of the birth of the poet Fernando Pessoa and that mark milestones in his life.
Fernando Pessoa is considered the greatest of Portuguese poets of the modern era.
In addition to being a poet, he also engaged in inventions and business. The company in question may have engaged in automatic translation.
The house on which the sign is placed was photographed on the same day Click for a larger image