\imathThe command \imath is used in LaTeX to produce a dotless 'i'. This is particularly useful in mathematical expressions where the dot of the 'i' might interfere with other notations, such as accents or overlines.
Dotless 'i' with a hat accent
\hat{\imath}Dotless 'i' with an overline
\overline{\imath}Dotless 'i' with a vector arrow
\vec{\imath}