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Apple makes typing mathematical symbols remarkably intuitive with built-in Option key combinations. Hold Option and press the Comma (,) key.

On Windows: Hold Alt, type 8804 on the number pad. Release Alt. ≤ appears. On Mac: Option + , (comma) gives you ≤. On Linux: Ctrl + Shift + u, then 2264, then space. In LaTeX: \leq In HTML: ≤

Word processing software often has its own built-in "autocorrect" logic for math. In many versions of Word, you can type ≤is less than or equal to