English to Arabic Other Computers: Software Phone Calling system

I have a document of calling system messages.
This tem is found in sentences like the following:
Enter your destination number or press the pound key for menu options.
For calls to North America, please dial one plus the three-digit area code, followed by the seven-digit local number, followed by the pound key.
This is a call from ITC press the pound key to accept.
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How should we translate "pound key" into Arabic?
Thank you!