Fischer projection
The Fischer projection is a two-dimensional representation of a linear monosaccharide showing the stereochemistry. The figure below shows - from left to right - (a) glucose in a relaxed conformation, (b) glucose in a conformation where the carbon chain is in an all-syn conformation, (c) the wedge-and-dashes representation with the carbon chain on the vertical axis and (d) the Fischer projection. This image is from https://commons.wikimedia.org/wiki/File:Fischer_projection_-_projection_of_D-glucose.png
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The coordinates of glucose are from https://sites.science.oregonstate.edu/~gablek/CH334/Chapter5/fischer.htm.