Technically, in mathematics we use "Fraktur" letters, not "Gothic"... These were introduced into mathematics 100 years ago by German mathematicians--in those days it was included in the German elementary schools.  

Here is the handwritten form:

[![Fraktur][1]][1]  

[source][2]


  [1]: https://i.sstatic.net/yuRAX.gif
  [2]: https://forums.gunboards.com/showthread.php?78181-German-Fraktur-letter-fonts