Full list of supported buttons:
Buttons used nearly everywhere
###Dollarify ($)
- Encloses selection in
$...$ - Enabled on all supported sites
- Keyboard shortcut: Alt-M
- Works differently on electronics.SE (gives
\$...$\because these people talk about money as well and mathjax needs escaping)
###Double Dollarify ($$)
- Encloses selection in
$$...$$ - Enabled on all supported sites
- Keyboard shortcut: None (use Alt-M twice, that should do the trick). Exception: Alt-D on electronics.SE
###SI-ify (SI)
- Encloses selection in
\:\mathrm{...}(upright text with an extra separator space for SI units) - Enabled on Physics, Chemistry, and Electronics
- Keyboard shortcut: Alt-S
##Site-specific buttons
###chem-ify (O2)
- Encloses selection in
$\ce{...}$(mhchem chemical equation formatter) - Use the
$button on the\ce'd text to make this a block element (use Alt-M) - Enabled on Chemistry only
- Keyboard shortcut: Alt-C
###Big O notation (O)
- Encloses selection in
$\mathcal{O}(...)$ - Enabled on Crypto.SE only
- Keyboard shortcut: Alt-C