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Almost every MP in the House of Commons for today's Prime Minister's Questions was wearing a purple, oblong badge.

Both Jeremy Corbyn and Theresa May wore the pins - as did many ministers and front-benchers in the chamber for the weekly clash of leaders.

At first glance, they may have appeared to be name badges.

But they were there to draw attention to an important event - World Autism Awareness Week.

Here's what that means, and what you can do to get involved.

PMQs purple badges

Every year, the National Autistic Society encourage the public to take part in the week, which leads up to World Autism Awareness day on April 2.

On their website, they explain: “We’ve come a long way in raising autism awareness but there’s still more to be done until everyone understands autism.“

To find out more, or get involved with World Autism Awareness Week, visit the National Autistic Society's website here.