t 1 or T 
(tē)
(tē)n. pl. t's or T's also ts or Ts
Idiom: 1. The 20th letter of the modern English alphabet.
2. Any of the speech sounds represented by the letter t.
3. The 20th in a series.
4. Something shaped like the letter T.
to a T
Perfectly; precisely: This actor fits the role to a T.
manhole cover, Seattle UtilityThis cast-iron manhole cover shows letters abbreviating the name of the Western Union Telegraph Company.