The set [of Flavita*] our three children received in 1884 from an old friend of the family (as Marina's former lovers were known), Baron Klim Avidov, consisted of a large folding board of saffian and a boxful of weighty rectangles of ebony inlaid with platinum letters, only one of which was a Roman one, namely the letter J on the two joker blocks (as thrilling to get as a blank check signed by Jupiter or Jurojin). (Ada, Part One, 36)

Ada had won the right to begin, and was in the act of collecting one by one, mechanically and unthinkingly, her seven 'luckies' from the open case where the blocks lay face down, showing nothing but their anonymous black backs, each in its own cell of flavid velvet. She was speaking at the same time, saying casually: 'I would much prefer the Benten lamp here but it is out of kerosin. Pet (addressing Lucette), be a good scout, call her - Good Heavens!'

The seven letters she had taken, S,R,E,N,O,K,I, and was sorting out in her spektrik (the little trough of japanned wood each player had before him) now formed in quick and, as it were, self-impulsed rearrangement the key word of the chance sentence that had attended their random assemblage. (Ibid.)

Jurojin and Benten are two of the seven lucky gods (Shichifukujin) of Japan. Jurojin is the god of wealth, wisdom and happiness for our long lives. Benten is the goddess of luck, love, eloquence, education, the arts, science, and patron of students, artists, geishas, and entertainers in the eating-and-drinking business. As I pointed out before, she is mentioned (as a sea goddess after whom the indigenous part of Yokohama was called) in the "Japanese" chapter of Jules Verne's "Around the World in Eighty Days."