Component type: 'letter'
The letter component displays a letter (or word) on the board. This is one of / the main component for magnetJS for the current time.
This defines the text to be displayed on the board
The theme id for the item (see Themes)
The x location of the item on the board (0 for center).
The y location of the item on the board (0 for center).
An array of the possible text to display on the board.
An array of potential theme ids for the items (see Themes)
The component type (in this case 'letter')