Platform Nine and Three-Quarters (Platform 9¾) was a hidden platform at King's Cross Station in London. Magically concealed behind the barrier between Muggle (=non-magic people) Platforms Nine and Ten, this Platform was where Hogwarts School of Witchcraft and Wizardry students boarded the Hogwarts Express every 1 September, in order to attend school.
In order for someone to get onto Platform Nine and Three-Quarters, they had to walk directly at the apparently solid barrier dividing Platforms Nine and Ten. When returning from Platform Nine and Three-Quarters, there was a guard stationed just outside the ticket barrier, in order to regulate exits from the platform through the gate, in order to not alarm the Muggles.
We old people know that too. ✊ And we do have Google.
In order for someone to get onto Platform Nine and Three-Quarters, they had to walk directly at the apparently solid barrier dividing Platforms Nine and Ten. When returning from Platform Nine and Three-Quarters, there was a guard stationed just outside the ticket barrier, in order to regulate exits from the platform through the gate, in order to not alarm the Muggles.
We old people know that too. ✊ And we do have Google.

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