Definition of tittles:
(n) :
(typography) Any small dot, stroke, or diacritical mark, especially if part of a letter, or of a letter-like abbreviation; in particular, the dots over the Latin letters i and j.
(n) :
(by extension) A small, insignificant amount (of something); a modicum or speck.
(v) :
(Scotland) To chatter.
(n) :
A surname.