digit

US /ˈdɪdʒ.ɪt/
UK /ˈdɪdʒ.ɪt/
"digit" picture
1.

any of the numerals from 0 to 9, especially when forming part of a number

:
The number 15 has two digits.
Please enter the last four digits of your phone number.
2.

a finger or thumb

:
He pointed with his index digit.
The monkey used its long digits to grasp the branch.