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In mathematics, I sometimes encounter Gothic letters, I mean the letters $\mathfrak A, \mathfrak B, \mathfrak C, \mathfrak D, \dots, \mathfrak a, \mathfrak b, \mathfrak c, \mathfrak d, \dots$. To get them in $\LaTeX$ one would use $\mathfrak{A}$ etc.
For example, in the book Model theory by Chang and Keisler, structures are denoted $\mathfrak A = (A, \dots)$, $\mathfrak B = (B, \dots)$ and so on.
I would like to know how to write this by hand.
The corresponding handwritten script is Sütterlinschrift (Sütterlin script). This chart (which I’ve now reproduced here) clearly shows you the letter forms.
Added 20 October 2022: Uppercase Sütterlin letters that I have seen used to write mathematics at the blackboard, in some cases by Jerry Keisler, include at least $A,B,G,M,N$, and $U$.
I would probably switch to caligraphic variant for uppercase letters. For lowercase, I personally write it as filled blackboard bold (mostly for $\mathfrak{c}$ as continuum), i.e. you apply the way you write $ℝ, ℂ$ to lowercase letters and fill the space between the doubled stroke. Alternatively, you can also turn the oval-based shape into a hexagonal one.
