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How do you input unicode mnemonics (RFC 1345)? For example - then + gives ∓. This cheatsheet is nice reference.

Vim, Emacs, Screen and ZSH all have the ability to enter these, however I am unsure how to do it in other gui programs (e.g. firefox, chrome).

How can I enter these?

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OP are you still looking for an answer? If so, you may need to repost your question as this is flagged for closure. Regards, –  Ringtail Mar 26 '12 at 21:38
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I'm not aware of a universal way (but then again, I was unaware of Vim's digraph input so thanks for introducing me to it). So far the only thing I've found is a Firefox extension to replicate Vim's digraph input mode.

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Also, reading the Wikipedia article linked in the question lead me to finding the Shapecatcher website which allows you to find Unicode characters by drawing them. The number of times this would have come in handy is large. I like this question, I'm learning a lot of useful stuff from it. –  Blair Dec 11 '11 at 9:28
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