Morpheus comments on Infra-Bayesian physicalism: a formal theory of naturalized induction

[Morpheus]

stands for “support”

I am guessing this refers to this notion of support I found on Wikipedia:

$supp\left(f\right)=\{x\in Domain(f\left)|f\right(x)\ne 0\}$

Edit: fixed Definition.

[Vanessa Kosoy]

It should be $f\left(x\right)\ne 0$. More generally, there is the notion of support from measure theory, which sometimes comes up, although in this post we only work with finite sets so it’s the same.