Sound symbolism is a linguistic phenomenon that consists of a relationship of analogy between the sound shape of words and their meaning.
Phonosemantics is a branch of Linguistics that studies the causes of sound symbolism and its applications in verbal communication.
Filippo M. Leonardi, A Geometrical Approach to Phonosemantics (2013).
Filippo M. Leonardi, Phonesthemes in Latin Language (2015).
Filippo M. Leonardi, The First Principle of Phonosemantics (2016).