The T-letter

[Shira Abel]

Please excuse my ignorance but what is a T-letter? I went through the
archives as suggested when it was first mentioned and found a lot of
messages referring to the T-letter, but none which actually explain what it
is. I did find one post with a link to an article, but the article had since
been removed from the location. I then did a Google search, which also left
me without an answer.

Could someone kindly explain what a T-letter is? and how does one write a
T-letter (besides typing shift+t and the word letter).

Thank you ever so much,

Shira