Like 9/11, the phrase 7/7 will forever be etched in our consciousness. It was the date a decade ago of the worst single terrorist attack on British soil.
On July 7, 2005, 52 people died and 770 were injured when four men with rucksacks full of explosives attacked central London.
Nobody who was around 10 years ago will ever forget that black day in our history.
The 10th anniversary was on Tuesday and most people remembered to pay their own tribute to the dead and injured.
Most people in most places that is, except Cascades shopping complex off Commercial Road in Portsmouth.
Sylvia Kendell from Cosham was furious that the mall did not come to a halt at 11.30am as the nation paid its respects.
She had expected a Tannoy announcement to be made calling for quiet and 60 seconds of quiet reflection.
But it did not come and the hustle and bustle of the shopping centre continued as usual.
Ms Kendell was upset and complained.
But at least the centre’s director Rhoda Joseph had the decency to hold up her hands and admit it was an oversight and apologised unreservedly.
We have witnessed Cascades’s minutes of silence many times in the past whether for the November armistice or anniversaries of 9/11, so we accept it was just that – an unfortunate mistake.
But this comes after the minute’s silence last Friday in the Guildhall Square to remember the victims of the Tunisia massacre was spoiled for some by rap music blaring from a big screen.
Portsmouth, with all its deep military connections, should do better.
But this does pose the question whether these various publicminutes of silence are becoming ubiquitous and therefore devalued.
Did the nation observe them after the various IRA atrocities of the 1970s and ’80s? No.
No one is denying we were all scarred in some way by 9/11 and 7/7, but perhaps the time has come to be left to remember these events individually, not en masse.