noun
digit
DIJ-it/ˈdɪdʒɪt/
A single symbol representing a number from zero through nine.
The wooden digit 7 rests on the table.

Etymology
The connection between a finger and a numeral comes from counting on fingers. Latin digitus already had counting-related senses, providing the bridge to a single numeral below ten.
In context
… get a single digit number for example ten will become one plus zero equals one twenty-seven will become two plus seven equals nine …
More examples
- The last digit of my phone number is zero.
- Enter all six digits of the security code.
- Changing one digit turns 125 into 128.
Forms
digit · digits