Fronts consist of a line with various half-shapes which depict which way the front is moving. Sometimes these are coloured, but to make it more difficult the examiner may make them black and white.
- (Red) half circles: a warm front.
- (Blue) triangle: a cold front.
- (Purple) half circles and triangles on the same side of the line: an occluded front.
- (Red and Blue) half circles and triangles on opposite sides of the line: an quasi-stationary (not moving) front.
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What type of front is represented by the following symbol?