Zenith number
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A Zenith number was a special type of telephone number in the United States which a subscriber could obtain, which was introduced prior to the development of toll-free service, which allowed a calling party to dial the number's owner at no charge by dialing Operator and requesting the specified Zenith number. In some places the name Enterprise was used. Some organizations continue to keep their Zenith numbers (The California Highway Patrol continues to use the same single number it has for decades, Zenith 1-2000), but with the low cost of incoming WATS service, the use of Zenith numbers has been deprecated to historical status.
The reason the name Zenith was used is that the letter Z did not, at that time, appar on the telephone keypad, thus the only way one could dial a 'Zenith' number was to dial Operator.