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## Identity Matrix Symbol (double ones)## LaTeX Forum: Fonts & Character SetsAdd tags
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Hi, how to type the identity matrix symbol (the double ones). I don't mean the
- Code: Select all • Open in online LaTeX editor
`\mathbb{I}`
I can't also find it in the The Comprehensive LATEX Symbol List. Please help! Last edited by haaj86 on Sat Aug 21st, 2010, edited 1 time in total.
- haaj86
**Posts:**21**Joined:**Mon Apr 6th, 2009
To be honest I usually use the big "I" to represent the indentity and most books uses this one. But I remember seeing this one:
I drew this with paint because I can't find a webpage that uses it. Thank you! Edit by localghost: No external links (see Board Rules)! Attachments go onto the forum server (where applicable). - haaj86
**Posts:**21**Joined:**Mon Apr 6th, 2009
Detexify says
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`\documentclass{article}` \usepackage{bbold} \begin{document} \( \mathbb{1} \) \end{document}
Joseph Wright
- josephwright
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**Posts:**813**Joined:**Tue Jul 1st, 2008
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