How to produce this curly T?
I tried Detexify, but nothing.
Another letter 'A' of the same unknown family:
Thank you
[Tex/LaTex] Symbol: Curly T
symbols
Related Solutions
The following are all considered special printing characters in LaTeX: # $ % & ~ _ ^ \ { and }. That is, they all tell LaTeX to do something; they're part of the language or syntax of LaTeX. In order to actually print any of these characters in the output, you have to "escape" the character. This is done by putting a \ in front of the character. (There are a few exceptions to this. One is the character \, which you can print in the output with the command \textbackslash, since \\ is a command used for line breaking in LaTeX. The other two exceptions are ^ and ~, which can both be used for appending diacritic marks to letters, such as \^{o} and \~{a}, for example. You can print these in the output by \^{} and \~{}, respectively, though see this post for more considerations about typesetting the tilde.)
Update: As @egreg points out in the comments, using thin spaces (\,) and \lvert and \rvert from the amsmath package are best practices for typesetting mathematics. Here is an updated MWE that uses both thin spaces and \lvert and \rvert. The accompanying picture will allow you to compare the differences.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[ M_R := \max \{\,\lvert f(z)\rvert:\lvert z-z_{0}\rvert=R\,\}\le M\]
\end{document}
As far as I can tell, at least in this case, there is no discernible differences between | and \lvert and \rvert. The reason that using the latter two is considered a best practice is because they are delimiters.
First case: square dot with equal spaceing
The first case is probably \centerdot of package amssymb:
\documentclass{article}
\usepackage{amssymb}
\begin{document}
\[
\exists n \in \mathbb{N} \centerdot \forall m \in \mathbb{N} \centerdot m < n
\]
\let\oldcenterdot\centerdot
\renewcommand*{\centerdot}{\mathrel{\oldcenterdot}}%
\[
\exists\,n \in \mathbb{N} \centerdot \forall\,m \in \mathbb{N} \centerdot m < n
\]
\end{document}
\centerdot is a binary operator. In the image in the question, the spacing seems to be slightly larger. Therefore the second line uses
- the spacing of a relational operator by redefining
\centerdotand - adds a thin space after the quantifiers.
Second case: round dot with asymmetrical spacing
In the second case a bold version of the dot could be used. The spacing seems to be a little special, the example uses
- half of a thin space at the left and
- a thick space at the right (as for relational operators).
\documentclass{article}
\usepackage{amsmath,amssymb}
\newcommand*{\anddot}{%
\mathclose{}%
\nonscript\mskip.5\thinmuskip
\boldsymbol{.}%
\;%
\mathopen{}%
}
\begin{document}
\[
\forall x \in \mathbb{R} \anddot x^2 \ge 0
\]
\end{document}
Best Answer
It may not be possible to get an exact match since we have no proof it could ever be an electronic font (simply scanned pixels) that could be either hand or lead inked
The closest modern electronic style based on two characters as A and T would be some form of Ronde (French School)