When Bond is playing baccarat with Xenia, his last hand, and only winning hand against her, is two face cards (a king and a queen ) and a six. In baccarat, face cards and tens are worth 0 and cards under ten are worth their number. So, his cards are, in order, 0-0-6, the code number of his lost friend, Alec Trevelyan (006).

James Bond Scenes : https://www.youtube.com/playlist?list=PL-v9MNQtvBaXxntoiB_QOJ2eTTPYrrG44

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