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The best from WIKI:
X1 In New York City, as Broadway crisscrosses major avenues, the resulting blocks are cut like triangles, and buildings have been built on these shapes; one such building is the triangularly shaped Flatiron Building which real estate people admit has a "warren of awkward spaces that do not easily accommodate modern office furniture" but that has not prevented the structure from becoming a landmark icon.
X2 The Sierpinski triangle, also called the Sierpinski gasket or the Sierpinski Sieve, is a fractal and attractive fixed set with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles. It is named after the Polish mathematician Wacław Sierpiński but appeared as a decorative pattern many centuries prior to the work of Sierpiński.
X3 The triangular theory of love is a theory of love developed by psychologist Robert Sternberg. Intimacy – Which encompasses feelings of attachment, closeness, connectedness, and bondednes.
Passion – Which encompasses drives connected to both limerence and sexual attraction.
Commitment – Which encompasses, in the short term, the decision to remain with another, and in the long term, plans made with that other.
X4 A love triangle (also called a romantic love triangle or a romance triangle) is usually a romantic relationship involving three people. Two main forms of love triangle have been distinguished: there is the rivalrous triangle, where the lover is competing with a rival for the love of the beloved, and the split-object triangle, where a lover has split their attention between two love objects.
"Gianciotto Discovers Paolo and Francesca" by Jean Auguste Dominique Ingres; it depicts the Divine Comedy
X5 In mathematics, Pascal's triangle is a triangular array of the binomial coefficients. Each number is the sum of the two directly above it.