"Zero prints" are the next step past single prints: rows in the profile where no TPO bracket traded at all — a literal hole in the price ladder, count = 0 rather than count = 1.

On continuously-traded futures these only appear where price actually gapped — an overnight/session gap, or a move so violent it jumped tick levels without printing. So a zero-print row is a true void: not just fast one-sided movement (single print), but a level that was skipped entirely.

Because nothing transacted there, they're the strongest imbalance of the three (untouched > single > low-volume node). They tend to act as gap-fill magnets — price is drawn back to close the void — and the edges of the gap behave as hard support/resistance on the return.