Before Tuesday night's game vs. the Philadelphia 76ers, the Boston Celtics demonstrated unity during the national anthem by locking arms:

This was a planned action by the team, as told by Celtics coach Brad Stevens:

"We've had a lot of sit-down discussions about it ... We've had a lot of individual discussions. We've had three or four meetings with the team after practices; sometimes just the players, sometimes just us, sometimes people that we've invited in from the outside to spend time with our guys. Our guys have been incredibly thoughtful."

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The demonstration may look familiar to some of the older audience members and/or TV viewers, as this same expression was done by the Celtics during the 1960-61 season to raise awareness amid rising racial tensions in the country:

Celtics #unity display goes back to 1960-61 season via @tvabby pic.twitter.com/dD5TMAdS25

— Chuck M. (@RedsArmy_Chuck) October 4, 2016

As "The Star Spangled Banner" was performed, the Celtics' Twitter account published a video from the team's players:

A message from our players on #unity. pic.twitter.com/enT6DALs1b

— Boston Celtics (@celtics) October 4, 2016

A subtle, yet powerful message.