multiple dependent claim

Patent claims are usually in the form of a series of numbered expressions, or more precisely noun phrases, following the description of the invention in a patent or patent application, and define, in technical terms, the extent of the protection conferred by a patent or by a patent application. They are of the utmost importance both during prosecution and litigation.
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a dependent claim which further limits and refers back in the alternative to more than one preceding independent or dependent claim. Acceptable multiple dependent claims shall refer to preceding claims using the terms "or, any one of, one of, any of, either." A multiple dependent claim may not depend on another multiple dependent claim, either directly or indirectly.

-- see 37 CFR 1.75 and  MPEP 608.01(n)

Context: Patent 

Any dependent claim which refers to more than one other claim.