Wiggins's own sortal relativity thesis permits objects to satisfy multiple phase sortals AND a substance sortal, leaving the uniqueness of the ultimate sortal empirically underdetermined.

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Sortal relativity thesis(as the main theory being described): The idea that an object can be classified or understood in different ways depending on what category or 'type' you're focusing on—like how a piece of wood can be both 'wood' and 'a table' at the same time.
Substance sortal(as another type of classification mentioned in the statement): A more permanent or fundamental way of categorizing something based on what it essentially is—like calling something 'an organism' or 'a living thing,' which describes what it fundamentally is.
Wiggins(as a reference to a specific philosopher's technical framework): David Wiggins is a British philosopher who developed important theories about identity—how we determine what makes something the same thing over time, like what makes you still 'you' even though your body changes.
empirically underdetermined(as used in epistemology (the study of knowledge))

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