jot or tittle

US /ˈdʒɑt ɔr ˈtɪtəl/
UK /ˈdʒɑt ɔr ˈtɪtəl/
"jot or tittle" picture
1.

a very small amount of something

:
•
He didn't change a jot or tittle of the original document.
•
The new law didn't differ a jot or tittle from the old one.
:
jot down jot down