England and West Indies players all took a knee in support of the Black Lives Matter movement before the first Test in Southampton.
Match officials also took part, while both sets of players are carrying a logo on their shirts.
Speaking on Tuesday, stand-in England captain Ben Stokes said: "We have a massive opportunity to do something really powerful as an England team.
"We are doing that by showing support towards the West Indies.
" After observing a moment of silence to remember the lives lost to the coronavirus pandemic and West Indies great Sir Everton Weekes, the players and officials took their positions as if to start the Test, while other squad members and backroom staff lined the boundary.
They all then dropped to a knee, with many of the West Indies players raising a right hand covered by a black glove.
There have been protests around the world since the death of American George Floyd in May.
Floyd, a 46-year-old unarmed black man, died after his neck was knelt on by a police officer for nearly nine minutes while he was being restrained.
Premier League players have knelt at the beginning of every match since English football's top flight resumed following the coronavirus lockdown.
Some Formula 1 drivers took a knee before Sunday's Australian Grand Prix.
In Southampton, the players and officials knelt for just over 20 seconds, and there was also a flag carrying the crest of West Indies and the Black Lives Matter logo hung in the tourists' dressing room.
Asked before the match whether any show of support for Black Lives Matter would be repeated throughout the three-Test series, Stokes said talks between England and West Indies were ongoing.
As they practised on Wednesday morning, England players wore training shirts that carried the names of key workers who have served through the coronavirus pandemic.
The people named on the shirts were nominated by their local cricket clubs and included teachers, doctors, nurses and carers.
"We're only able to play this Test match because of the amazing job that key workers up and down the country have done to help us through this pandemic," said Stokes.
"Wearing their names is a real honour for us, and is a small sign of our appreciation for the incredible work they have done.