logCanonicalThreshold(A)
lct(A)
The log-canonical threshold of $A$ defined by a polynomial $f$ is the least number $c$ for which the multiplier ideal $J(f^c)$ is nontrivial.
Let's consider Example 6.3 of Berkesch and Leykin from arXiv:1002.1475v2:
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Note that $A$ is allowed to be a multiarrangement.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/HyperplaneArrangements.m2:3314:0.