The ambition of this chapter is to delimit the field of hermeneutics, which is in contrast to other sciences or philosophies of language. The path we are exploring offers a paradoxical twofold movement, both shrinking and expanding hermeneutics. Interpretation only arises for a particular category of signs, the meaning of which is problematic depending on given contexts and the experience of the interpreters. At the same time, we add a movement, on another plane, of enlargement of the object of hermeneutics. As problematic meanings are in no way reducible, neither to linguistic signs (utterances, texts...), nor to two-way signs (symbols) which are only a part of it. In other words, any sign (iconic, indicative or linguistic) whose source can be natural or conventional, via visual, auditory or olfactory channels involves a problematicity, as it is resistant to immediate understanding, and can be interpreted and correlatively fall within the field of hermeneutics.