a star and a noughts and crosses board
Binary digits are 'bits'. There are only two of them. It doesn't matter what you call your digits or how you write them, as long as you do all of your binary arithmetic with only two symbols.
A telephone number in Lesotho are eight digits long with the first two numbers being its area code.
A telephone number in Lesotho are eight digits long with the first two numbers being its area code.
You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.
The Nortel t7316e is a digital telephone with two lines, 24 memory buttons, and a display. It is primarily used in offices by supervisors and assistants.
two digits
two
There are hundreds of electronic symbols...which two do you have in mind.
+9 is not a ZIP Code. ZIP Codes are postal codes used in the USA. They are uniformly 5 digits, with a 4-digit extension. There are telephone country codes that begin with +9, but you need one or two more digits.
The hexadecimal system is the fourth system based on powers of two that use the decimal digits 0 through 9. Since 16 symbols are needed the letters a through f are added. The next system would use 32 symbols so 22 additional symbols would be needed.
It is an integer of 14 comprising two digits of 1 and 4
There are hundreds of electronic symbols...which two do you have in mind.