Mathematical singular terms occur in canonical scientific theories whose indispensability is argued by Quine-Putnam, giving them stronger ontological pressure than propositional terms.

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Canonical scientific theories(in philosophy of science): The established, widely-accepted scientific theories that we currently rely on to describe how the world works.
Indispensability(describing what makes something essential to philosophical theorizing): Something that is absolutely necessary and cannot be done without. If something is indispensable to a theory, that theory cannot work or make sense without it.
Mathematical singular terms(in philosophy of mathematics): Specific names or references to mathematical objects, like 'the number 5' or 'pi'—as opposed to general statements about math.
Ontological pressure(in metaphysics and philosophy of mathematics): The degree to which something pushes us to believe it actually exists in reality, rather than being just a useful tool or concept.
Propositional terms(in logic and philosophy of language): Words or phrases that represent claims or statements that can be true or false, as opposed to names of things.
Quine-Putnam (argument/indispensability argument)(in philosophy of mathematics): An argument by philosophers Willard Quine and Hilary Putnam that if mathematics is necessary for our best scientific theories to work, then mathematical objects must actually exist.

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