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: — /  ---  

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 ↑ /  &uparrow;  
  • Downwards arrow ↓ /  &downarrow;   
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