Freethought:

Freethought (sometimes spelled free thought) is a social movement espousing unorthodox attitudes and beliefs, formed independently from authority, tradition, revelation, or dogma.

The cognitive application of free thought is known as freethinking, and adherents of freethought are known as freethinkers, which the Collins English Dictionary defines as someone "mentally free from the conventional bonds of tradition or dogma, and thinks independently." In some contemporary thought in particular, free thought is strongly tied with rejection of traditional social or religious belief systems. Freethinkers hold that knowledge should be grounded in facts, scientific inquiry, and logic. The skeptical application of science implies freedom from the intellectually limiting effects of confirmation bias, cognitive bias, conventional wisdom, popular culture, prejudice, or sectarianism.

The term first came into use in the 17th century in order to refer to people who inquired into the basis of traditional beliefs which were often accepted unquestioningly. Today, freethinking is most closely linked with agnosticism, deism, secularism, humanism, anti-clericalism, and religious critique.(...)

Symbol of Freethought:

The pansy serves as the long-established and enduring symbol of freethought(...) The reasoning behind the pansy as the symbol of freethought lies both in the flower's name and in its appearance. The pansy derives its name from the French word pensée, which means "thought". It allegedly received this name because the flower is perceived by some to bear resemblance to a human face, and in mid-to-late summer it nods forward as if deep in thought.

(Fonte: wikipedia.org)