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The word se carries two very different meanings depending on whether you are looking at a map or a periodic table. In navigation, it represents the compass point midway between south and east, often abbreviated as SE. In the world of science, it is the chemical symbol for selenium, a nonmetallic element used in photocells and essential for many living organisms. This lesson explores the grammatical roles and technical applications of se in both geography and chemistry. You will learn how to distinguish between these meanings through context and capitalization. Watch this video to master the usage of this versatile term.

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A sailor checks the compass, noting the ship is heading SE.