redness trope

The term "redness trope" in philosophy refers to a specific concept within trope nominalism. This philosophical stance posits that things are characterized by "tropes," which are particular instances of properties. For example, a red disk has a "redness trope" as a part, making it red. These tropes are considered "abstract particulars," meaning they are not repeatable and cannot exist in more than one thing simultaneously.

This contrasts with universals, which are properties that can be shared by multiple objects. The concept of tropes helps address philosophical problems like how to account for resemblances between objects. While "redness" itself is the longest wavelength of light visible to the human eye, a "redness trope" is the philosophical concept of a particular, individual instance of that property.12