What is the mouse pointer to a small, sloping arrow?

The question was raised as to whether the mouse pointer was designed to have this tilted little arrow for any particular purpose? I can understand that this tilted arrow can be a good indication of a text. But is there any particular reason?

Reply 1: Historical reasons.

The mouse inventor Douglas Englebart the first design of the pointer is vertical. But it was tilted when the pointer was compiled on a computer in the Xerox PARC Research Center. The main reason is that, considering the low resolution of the computer monitor at the time, the performance of the ' slash ' is more clear than the ' straight line ', easy to identify. If you want to adhere to the vertical mouse pointer, in order to see the words, the original design needs to be twice times the size of the line.

Then bill teacher copy the design of Douglas, then Steve Teacher also copy them.

Reply 2: Computer easy to calculate mouse position (but this answer was quickly rejected by netizens, because it is like rather than)

Because the mouse position starts with the upper-left pointer arrow, this tilted pattern makes it easier to calculate the position and trajectory of the pointer.

Reply 3: It's instinct.

As pictured above.