An unwritten FA law means fans are likely to see triangular corner flags at the grounds of only 45 English clubs around the country if they wish to use them.
Corner flags rarely get much attention in English football or the Premier League unless the likes of former Leicester City striker Jamie Vardy are using them to celebrate wildly after finding the back of the net. They are compulsory and must abide by several rules regarding height and safety, and must not be pointed or dangerous.
While clubs are given free rein to make these flags look as trendy as they wish, most clubs respect the unspoken law regarding their shape. It's because of this that all but one top-flight club are likely to have rectangular-shaped flags this season.
FA's 'Rule' Over Triangular Corner Flags
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Crystal Palace have had reason to celebrate over the past year after winning the FA Cup at Wembley last season with a 1-0 victory against Manchester City in the final. Oliver Glasner's men followed that up with a Community Shield triumph against Arne Slot's Premier League champions.
Many of the Eagles' supporters will have got their bunting out in May, following the South Londoners' win of two trophies last month. But the club itself have also been using triangular flags to show off their historic FA Cup feat.
It is a long-held tradition for winners of English football's oldest cup competition to change flags in recognition of their FA Cup win. This 'rule' has been in place for decades and adopted by clubs across the English football pyramid.
Palace aren't the first Premier League club to change their flag, as 14-time FA Cup-winning record-holders Arsenal have previously made the switch. The shape gives the flags an old-school look, which ties in with the iconic tournament it represents.
One fan attended Selhurst Park and noticed the change and what it means for the South London outfit. They wrote: "Don't know if anyone else noticed today, but Selhurst Park was proudly displaying triangular corner flags! (You know what that signifies)."
Can Crystal Palace Use Triangular Flags in Europe?
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While Palace can use triangular flags in the Premier League, they won't be used in their Europa Conference League campaign. UEFA competition rules require competing clubs to use rectangular flags only to ensure "visual consistency".
UEFA do not share the same laws as the FA, meaning the Eagles must rotate each matchweek when they play European football midweek before domestic club football on the weekend. That's also the case for clubs such as Arsenal and Liverpool playing in the Champions League, and those including Nottingham Forest, who replaced Palace in the Europa League.