A Russellian logically proper name must directly acquaint the thinker with the named object, but acquaintance with sense data mediates rather than constitutes acquaintance with Bill as an extra-mental particular.

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Russellian: "Russellian" refers to ideas, methods, or approaches developed by Bertrand Russell, a highly influential British philosopher and mathematician (1872-1970). Russell championed logical analysis as a tool for solving philosophical problems and made major contributions to mathematics, logic, and social criticism. Today, "Russellian" typically describes work that follows his style of clear, precise thinking that breaks down complex ideas into simpler logical components.
acquaint/acquaintance(as used in epistemology (theory of knowledge)): Direct, personal knowledge of something through your own experience—like knowing someone by actually meeting them rather than hearing about them.
extra-mental particular(as used in metaphysics and epistemology): A specific, real thing that exists outside your mind—like an actual person (Bill) as opposed to your thoughts or memories about that person.
logically proper name(Russell's restrictive criterion): A genuine name that can only be had for that with which one is acquainted — something for which misidentification is not rationally open and whose existence is certain.

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