English to Arabic Tech/Engineering Electronics / Elect Eng Mobile phone manual

"*" key:
Press the asterisk key to enter "*".
Press the "*" key twice in a row to enter "+", to make an international call.
Enter the number, and then press the "*" key three times in a row to enter "P", or press the "*" key four times in a row to enter "W". Then enter the extension number.
Delete key: In text editing mode, Press the delete key to Delete front content

What does these stand for?