The blank banner tradition dates back to former head coach Doc Rivers, who originally arranged to mark the space where the team's 18th banner would be at the team's old practice facility in Waltham.

WALTHAM — So we all know about the 17 banners the Celtics have won, commemorating their 17 NBA championships. But there’s a mysterious, blank, 18th banner hanging just next to the 2008 World ...

"The biggest thing was that we all want to get better; we want to strive to compete to fill in that blank banner up there," Stevens said, hoping to bring "Banner 18" to Boston.

Jayson Tatum Speaks About the Blank Banner and Chasing #18 in 2018 Take a look back to 2018 as Jayson Tatum talks about the blank banner and how the Celtics are chasing #18!