A tweeted photo of Bill Russell kneeling while wearing his Presidential Medal of Freedom surfaced Monday in an apparent gesture of solidarity to the sports world's reaction to President Donald Trump's recent comments regarding NFL players.

A solemn-faced Russell, bearing his trademark white goatee and crew cut, is shown bent to the floor in what appears to be the beige-carpeted room of a home, balanced on his right arm with his other arm resting on his thigh, looking intently into the camera in a light-blue T-shirt and khaki slacks.

"Proud to take a knee, and to stand tall against social injustice," the photo's caption reads, followed by the hashtags #takeaknee #medaloffreedom #NFL #BillRussell #MSNBC.

Dangling from his neck is the Presidential Medal of Freedom he was awarded by President Barack Obama in 2011. The Medal of Freedom is the nation's highest civilian honor.

The photo appeared on an unverified Twitter account, created earlier this month, that had no avatar and just one tweet.

Russell, 83, inducted into the Hall of Fame in 1975, was an 11-time NBA champion with the Boston Celtics and won five NBA MVP awards.