The mouse, and therefore the mouse cursor, was invented by Douglas Englebart, and was initially an arrow pointing up. When the XEROX PARC machine was built, the cursor changed into a tilted arrow. It was found that, given the low resolution of the screens in those days, drawing a straight line and a line in the 45 degrees angle was easier to do and more recognizable than the straight cursor.
Archery, Arrows Arrow Flight — There is a critical distance at about 5 to 8 metres. If the arrow hits fetching end "up", the nocking point needs to be lowered, and if it hits tail end down, the nocking point needs to be raised.