When you watch football matches you might've noticed that sometimes players are wearing black armbands.
The armbands are worn to mark tragic occasions, these can be historic anniversaries like Hillsborough or the Munich air crash disaster. Traditionally a black armband is a sign of mourning. Often, sports events may also hold a minute's silence to mark an occasion.
The black armbands are normally worn on a players right arm, so they are not confused with the captain's armband which is usually on the left sleeve.
Premier League players will wear the armbands in their next fixtures as a show of respect for Leicester City owner Vichai Srivaddhanaprabha.
Mr Srivaddhanaprabha died with four other people after their helicopter crashed outside Leicester City's ground following the game against West Ham United.