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In the mathematical discipline of graph theory, a graph labeling is the assignment of labels, traditionally represented by integers, to the edges or vertices, or both, of a graph. Formally, given a graph G, a vertex labeling is a function mapping vertices of G to a set of labels. — “Graph labeling - Wikipedia, the free encyclopedia”, en.wikipedia.org
In practice, for both practical and safety reasons, almost all recent applications of the "doubly-labeled water" method use water labeled with the heavy, non-radioactive forms of the elements deuterium and oxygen-18 (O-18 or 18O), or deuterium oxide-18 (D218O). — “Doubly-labeled water - Wikipedia, the free encyclopedia”, en.wikipedia.org
"Mis-Labeled" is a third season episode of the television series Law & Order: Criminal Intent. The tainted vials being sold in 2004 in Thailand were labelled with green labels—old HIV-tainted human-derived Factor VIII was being sold as synthetic Factor VIII!. — “Mis-Labeled - Wikipedia, the free encyclopedia”, en.wikipedia.org