projection (geometry); legendary creature 'yu'
Meanings
2 senses · 5 examplesnoun
projection (geometry); the foot of a perpendicular from a point to a line or plane
technicalTechnical term in projective geometry describing the shadow or image cast by geometric figures onto lines or planes.
Find the coordinates of the projection of point P onto line L.
The length of the projection of this line segment onto the plane is shorter than the original segment.
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Projective geometry studies the properties of figures that remain invariant under projective transformations.
noun
legendary creature 'yu' (蜮) said to shoot sand at people's shadows; insinuating attack
literaryRefers to the mythical creature in ancient Chinese legends. The term appears in the idiom 含沙射影 (hán shā shè yǐng), which means to attack someone by insinuation or innuendo.
Ancient legends say there were monsters in the rivers that could cast shadows and shoot sand, causing people to fall ill.
Attacking someone by insinuation and hurting them secretly is a despicable method.