The position of a card’s printed image relative to its borders, expressed as a ratio (e.g., 55/45 left/right, 60/40 top/bottom). Centering is one of the four sub-grades evaluated by PSA, BGS, CGC, and SGC, and is often the single most decisive factor between a Mint and Gem Mint grade.
For pre-1980 cards, centering of 60/40 or better is genuinely rare; modern foil cards typically need 55/45 to grade at the top. Read the full sub-grade guide.