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Regulation signs are usually white rectangles with black lettering.
Yellow triangles and squares can typically be found on channel buoys and markers to indicate certain information to boaters. Yellow triangles usually indicate caution or danger, such as shoals or rocks, while yellow squares often mark information or regulatory signs, such as speed limits or navigation rules.
A line graph
They are referred to as "diamond-shaped". Geometrically, however, most US traffic warning signs are actually squares that have been rotated 45 degrees from horizontal, rather than diamonds, which have no right angles.Read more: What_shape_are_the_road_signs_that_give_warningIn other countries, road construction and other warning signs are generally triangular with a white or yellow background and a red border.
You add all the numbers with + signs and subtract all that have minus signs.