Congruent Symbol (≅)

Congruent Symbol uses ≅, U+2245 APPROXIMATELY EQUAL TO, in the reviewed geometry intent as a congruence sign. A statement such as △ABC ≅ △DEF says that the two triangles correspond in size and shape under the notation adopted by the text or course. Vertex order matters. A, B, and C correspond to D, E, and F in the same positions, so changing the order can change the claimed correspondence. Segment and angle statements also need the objects on both sides to be named clearly. Congruence is not the same as ordinary equality =, approximate equality ≈, identity ≡, or geometric similarity. Different publications may choose notation conventions, so the symbol should be interpreted under the source’s definitions rather than assumed from shape alone. In accessible math, the relation should be read as “is congruent to.” A diagram should not rely on the glyph alone; matching tick marks, labels, or explanatory text can make the correspondence clear. Plain-text copying is useful for notes, while formal documents may use structured math markup. Unicode establishes the encoded character, and the mathematical references in the source set support the relation-focused scope. The page does not expand into triangle-congruence proofs, postulates, or a full geometry lesson without additional sources. For Congruent Symbol, those samples represent equations, proofs, technical documents, and math education; each one supplies the surrounding context that the symbol alone cannot provide. Define the relation if the audience may read ≅ differently. Use structured math markup in formal proofs.