Presumably you're referring to Roman numerals?
Any numeral with an horizontal line above it indicates multiplication by a thousand.
The little known Roman numeral which looks like an S represents a half and the Latin word for it is semis meaning a half.
Therefore, S with a line above it would equal D (1000*1/2 = 500)
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Assuming it is a spped v/s time graph, a horizontal line represents motion at a constant speed.
sin(63) = 0.891 cos(63) = 0.454 24 meters per second at an angle of 63 degrees above the horizontal = => 10.896 m/s horizontally => 21.384 m/s vertically
Mark a point on the x-axis as 's', then draw a solid line through this point, with a slope of 1. Then shade in the area above this line. The region above the line is shaded because if x-s < y then y > (x-s). The line is drawn as a solid line to represent that it can be equal, as well. At the point x=s, y = 0, which is where you marked s on the x-axis.
The word gap means a big space with no #s on a line plot.
Primsol line is a line that has many waters applied to it. Such as Tropical Fresh water (TF) - Fresh water (F) - Tropical salt water (T) - Summer salt water (S) - Winter salt water (W) - Winter Northern Atlantic water (WNA). It is in that exact order read above. TF | | -F | | -T | | -S | | -W | | -WNA !