It is easy to add symbols & arrows into cards, using the following notation:
Symbols
Copyright: © /
(C)Trademark: ™ /
(TM)Registered Trademark: ® /
(R)Section Sign: § /
(P)Plus/Minus: ± /
+-En Dash: – /
--Em Dash: — /
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Arrows
Leftwards arrow: ← /
<--Rightwards arrow: → /
-->Left-right arrow: ↔ /
<-->Leftwards double arrow: ⇐ /
<==Rightwards double arrow: ⇒ /
==>Left-right double arrow: ⇔ /
<==>
Here is an example of the arrows in action with a simple chemical equation.
You can also add up and down arrows using the following unicode notation:
Upwards arrow ↑ /
↑Downwards arrow ↓ /
↓