What does 'd' stands for in - move(double dx, double dy)?

Question

I am reading a java doc for GObject /acm.graphics.

I am looking at this method:

move(double dx, double dy) 

Moves the object on the screen using the displacements dx and dy.

I am trying to understand what does the 'd' stands for and what is the difference between (dx,dy) Vs (x,y)? Is there any difference or there is none and it is only a different name for the same coordinates?

Answer 1

move(double dx, double dy) Moves the object on the screen using the displacements dx and dy.

In this context dx would be "displacement on the x-axis" and dy would be "displacement on the y-axis". The method would move the object dx units along the x-axis, and dy units along the y-axis, where the units are presumably pixels.