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
###Exit math mode
- Not an actual button, only a hotkey
- Enabled on all supported sites
- Finds the next dollar symbol and puts the cursor ahead of it. Useful to keep the flow of typing.
- Keyboard shortcut: Alt-Z
###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
Vector Fields(E)
- Encloses selection in
\mathbf{...} - Enabled on Physics.SE only
- Keyboard shortcut: Alt-V
###Big O notation (only a hotkey)
- Encloses selection in
$\mathcal{O}(...)$ - Enabled on Crypto.SE, CS.SE, and cstheory.SE only
- Keyboard shortcut: Alt-O
###Sans-serif (NP)
- Encloses selection in
$\mathsf{...}$ - Enabled on CS/CStheory.SE only
- Keyboard shortcut: Alt-S