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Blackboard bold characters

I want to make a blackboard "1" character to show an indicator variable, but $\mathbb{1}$ doesn't work. How do I do it?

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This has already been answered here. – Hendrik Vogt Sep 26 '10 at 15:17

marked as duplicate by Joseph Wright♦ Sep 3 '11 at 20:44

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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symbols (see “How to look up a math symbol?”) lists the following packages: bbold, mathbbol, mbboard, bbm (with \mathbbm, \mathbbmss or \mathbbmtt) and dsfont (with or without the sans option).

Alternatively, XeTeX+unicode math supports it directly.

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