A tittle is more or less the same thing (the dot over an i, for instance), except that it can be traced back to Medieval Latin for a little mark over or under a letter, such as an accent ague or a cedilla. I don't know whether an umlaut is one or two tittles. Maybe it's a jot and a tittle side by side.
being less in love, she yawned a little, / And felt her veins chilled by the neighbouring sea; / And so, she cooked their breakfast to a tittle .