# How to write these symbols (double times)

I want to know how could I do these

Thank you Steven B. Segletes for your help, I got the desired result with the code below.

\usepackage{stackengine}

\DeclareMathOperator*\dtimes{\times\mkern-11.00mu
\ensurestackMath{\raisebox{-0.90pt}{\stackanchor[-3.50pt]{\times}{\times}}}
\mkern-10.90mu\times}


• Can you show or at least describe, what you already tried? – TobiBS Aug 25 '20 at 19:21
• I used to use \DeclareMathOperator*{\hash}{\#}, But it feels bad – dugu1987 Aug 25 '20 at 19:31

\documentclass{article}
\usepackage{amsmath,stackengine}
\DeclareMathOperator*\dtimes{\times\mkern-7.95mu
\ensurestackMath{\raisebox{.1pt}{\stackanchor[-.00pt]{\times}{\times}}}
\mkern-8mu\times
}
\begin{document}
$\dtimes_{\lambda \in\Gamma} \mathcal{T}_\lambda \qquad \mathcal{T}_\lambda \dtimes \mathcal{T}_\lambda$
\end{document}


and this

Here, there are different approaches. Using \varhash from mathabx package: it is can be rotated if you prefer: the description is adopted in the 2nd MWE with the command \rotatebox used with \usepackage{graphicx}.

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{mathabx}
\usepackage{scalerel}

\DeclareMathOperator*{\slantedhash}{\scalerel*{\varhash}{\sum}}

\begin{document}
Using \verb|\varhash| as sum operator:
$\underset{\lambda\in\mathcal{T}_{\lambda}}{\slantedhash}\mathcal{T}_{\lambda}$
Using \verb|\varhash| as binary operator:
$\mathcal{T}_{\lambda} \mathbin{\varhash} \mathcal{T}_{\lambda}$
\end{document}


Using stix fonts with the rotated command \equalparallel:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{stix}
\usepackage{graphicx}

\begin{document}
$\underset{\lambda\in\mathcal{T}_{\lambda}}{\rotatebox[origin=c]{-45}{\equalparallel}}\mathcal{T}_{\lambda}, \quad \mathcal{T}_{\lambda}\rotatebox[origin=c]{-45}{\equalparallel} \mathcal{T}_{\lambda}$
\end{document}


With boisik package there is the symbol: \smashtimes. Or using the classic rotation of the symbol \#

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\usepackage{graphicx}

\begin{document}
$\underset{\lambda\in\Gamma}{\rotatebox[origin=c]{-20}{\#}}\mathcal{T}_{\lambda}, \quad \mathcal{T}_{\lambda}\mathbin{\rotatebox[origin=c]{-20}{\#}} \mathcal{T}_{\lambda}$
\end{document}