What is dot in the i?

The dot in the "i" is a diacritical mark, also known as a tittle. It is used to distinguish the letter "i" from other letters with similar shapes, such as "j" or "l". The dot is typically placed above the lowercase "i" and is not always present in uppercase letters. In some languages, the dot may have a different shape or placement, such as in Turkish where it is placed below the letter "i". The use of the dot in the "i" dates back to ancient Greece and has been part of the Latin alphabet since its inception.