Finally the Knight of Spades has come to light. The expansion of the Knight into a deck of cards is important since they already exist in a Tarot deck. The Knight ranks above the Jack and below the Queen in a normal deck. Yet ranks below a Baron and Baroness in an expanded royal deck. Thus there is also the Knight of Hearts, Knight of Diamonds, and Knight of Clubs.
Knights are represented by the letter G. K is already taken by the King. G can also mean Gallantry as in a Gallant Knight saved the day.