Etymology
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Brontë 

surname of the famous family of English authors; the current version is a scholarly convention and until after the deaths of the sisters it was variously spelled and accented. Juliet Barker ("The Brontës," 1994), writes that their father was registered at Cambridge in 1802 as "Patrick Branty," which he soon corrected to Bronte. The family was Irish Protestant. "At a time when literacy was extremely rare, especially in rural districts of Ireland, the usual Brontë name was spelt in a variety of ways, ranging from Prunty to Brunty and Bruntee, with no consistent version until Patrick himself decided on 'Bronte'." [Barker]

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T 

twentieth letter of the English alphabet; in the Phoenician alphabet the corresponding sign was the 22nd and last; everything after T in the modern alphabet represents European alterations or additions. The sound has been consistent throughout its history.

In Late Latin and Old French, -t- before -e- and -i- acquired the "s" value of -c- and words appeared in both spellings (nationem/nacionem) and often passed into Middle English with a -c- (nacioun). In most of these the spelling was restored to a -t- by or in the period of early Modern English, but sorting them out took time (Edmund Coote's "English Schoole-maister" (1596) noted malicious/malitious) and a few (space, place, coercion, suspicion) resisted the restoration. 

To cross one's t's(and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly, with utmost exactness" is recorded from 1690s, though the exact signification remains uncertain despite much speculation. The measuring tool called a T-square (sometimes suggested as the source of this) is recorded by that name only from 1785. The T-cell (1970) so called because they are derived from the thymus. As a medieval numeral, T represented 160. A T was formerly branded on the hand of a convicted thief.

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