X2 Mult for every Jack in the played hand. (Calculated during the Joker phase of score calculation.)
Based on what Jacks were originally called in England during the 16th-17th century, Knaves.
https://en.m.wikipedia.org/wiki/Jack_(playing_card)
Alternate names:
Knabe, in German
Valet, in French, or in Tarot games
In the Euchre family of games; Bower, in English; or Bauer, in German
A Jack or Knave, in some games referred to as a Bower, in Tarot card games as a Valet, is a playing card which, in traditional French and English decks, pictures a man in the traditional or historic aristocratic or courtier dress, generally associated with Europe of the 16th or 17th century. The usual rank of a jack is between the ten and the q...