latex command for the symbol like UI

Depending on the fact you want it as a binary operator or as a binary relation, you can try

\newcommand{\binsubseteq}{\mathbin{\text{\rotatebox[origin=c]{90}{$\subseteq$}}‌​}}

or

\newcommand{\relsubseteq}{\mathrel{\text{\rotatebox[origin=c]{90}{$\subseteq$}}‌​}}

They both require amsmath and graphicx.

MWE

\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}

\newcommand{\binsubseteq}{\mathbin{\text{\rotatebox[origin=c]{90}{$\subseteq$}}}}
\newcommand{\relsubseteq}{\mathrel{\text{\rotatebox[origin=c]{90}{$\subseteq$}}}}

\begin{document}

\[
 A \binsubseteq B_{A \binsubseteq B_{A \binsubseteq B}}
\]

\[
 A \relsubseteq B_{A \relsubseteq B_{A \relsubseteq B}}
\]

\end{document} 

Output