Special subset symbol

Question

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.

Answer 1

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.

\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}