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The symbol \Subset provides a subset symbol which "repeats itself twice," essentially. Is there anyway to produce the same symbol which "repeats itself thrice" (i.e., take two lines in between the standard \subset symbol)?

Thank you.

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    Welcome to TeX.SX. There is no such symbol in any package I know. You could design one using TikZ or by scaling and combining other symbols, but they would look inconsistent compared to the existing \subset symbol. There really isn't enough room inside \Subset to fit a third and have it look good. What would the meaning of such a symbol be?
    – Sandy G
    Commented Nov 8, 2022 at 23:38
  • @SandyG Thank you for the response. It is for a certain type of inclusion relation that extends on the other two (generalizing \subset and \Subset). Even if the relation is much larger than the other two, is it possible to give an example?
    – kolagorem
    Commented Nov 9, 2022 at 5:07
  • @SandyG The third line can be very small, like the size of the letter c.
    – kolagorem
    Commented Nov 9, 2022 at 5:08

1 Answer 1

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Here is a make-your-own solution with TikZ. The sizing is not great, but I'm not sure how to make it more consistent with the ordinary \subset symbol.

enter image description here

\documentclass{article}

\usepackage{amssymb}
\usepackage{tikz}

\newcommand{\SSubset}{\mathrel{\tikz[yscale=.2, xscale=.22]{
  \draw[line cap=round](1,1)--(.5,1) arc(90:270:.5) -- (1,0)
    (1,.8)--(.5,.8) arc(90:270:.3) -- (1,.2)
    (1,.6)--(.5,.6) arc(90:270:.1) -- (1,.4);
}}}

\begin{document}

$A\SSubset B\Subset C\subset D$

\end{document}

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