Baseball card number is a term used to refer to the unique number printed on the back of a baseball card. The crossword solutions for this term are STAT (4 letters), TEL (3 letters), and NINE (4 letters). STAT stands for Statistics, which are the numerical data related to a player's performance. TEL stands for Telltale, which is a company that produces baseball cards. NINE stands for NINE-Digit, which is the length of the unique number printed on the back of the card.