0
A large geographical area, such as a state
If you're asking about telephone area codes, 750 is not currently used in the North American Numbering Plan.
toll-free telephone numbers in the North American Numbering Plan. Area code 877 (Russia), Republic of Adygea.
I recommend the World Telephone Numbering Guide.
yes it is different. the Japanese number system is the Chinese number system but the Japanese changed it to make it unique.