‘斜角’ (xié jiǎo) literally combines ‘斜’ (xié), meaning ‘slanted’ or ‘oblique’, and ‘角’ (jiǎo), meaning ‘angle’. Together, it refers to an angle that is neither right (90°) nor straight (180°), but falls somewhere between — typically any acute (less than 90°) or obtuse (greater than 90° but less than 180°) angle. It emphasizes the non-orthogonal, diagonal orientation of lines or surfaces.

This term appears frequently in geometry, engineering, architecture, and design contexts — for instance, when describing the tilt of a roof, the slant of a camera shot, or the arrangement of leaves on a stem (phyllotaxis). While technically precise, ‘斜角’ is more commonly used in technical or descriptive writing than in casual speech, where simpler terms like ‘斜的’ (slanted) or ‘歪的’ (crooked) may suffice. It carries a neutral, objective tone and is not idiomatic or metaphorical.