特 (tè) is a formal, written adverb meaning 'especially, particularly' — it is more concise and literary than the everyday 特别 (tèbié). Unlike 尤其 (yóuqí), which singles out one item from a group ('especially among them'), 特 simply emphasizes degree or specificity. It can also mean 'specifically' (as in 'this symbol specifically refers to...').