Prince William, Kate Middleton and Prince Harry have come up with a hashtag for their mental health campaign.

The royal trio has been active in promoting mental health for years now. As part of their endeavor, they decided to use a trademark for their mental health campaign. The Royal Foundation, set up by the Duke and Duchess of Cambridge and Prince Harry, applied to trademark the hashtag #stopspeaksupport for their mental health work, Daily Mail reported.

The trademark request was filed on Oct. 4 by Bates Wells & Braithwaite London LLP on behalf of the Royal Foundation. It calls for trademark use under printed matter, banners, posters, instructional and teaching materials, promotional and campaign ads that are all related to mental health, Royal Central reported. The trademark will also apply to "healthcare services in relation to mental health; advisory, consultancy and information services in relation to healthcare and to mental health."

The trademark request was published on the Intellectual Property Office's website on Oct. 20. But the foundation has yet to announce the campaign linked to the hashtag. However, it is believed that it aims to offer help for those suffering from mental health conditions.

Prince William, Middleton and Prince Harry are determined to promote mental health awareness. In fact, earlier this month, they celebrated World Mental Health Day and honored the people working in the mental health sector across the UK.

Middleton, who had been out of the spotlight and on bed rest due to severe morning sickness for a while, made her first public appearance since the announcement of her third pregnancy at the event. Unfortunately, the Duchess of Cambridge was bump-shamed due to her tiny baby bump. However, this did not stop Middleton from returning to her royal duties.

On Oct. 16, the royal trio were spotted at the Paddington Station in London for another charity event. During the sighting, Middleton looked much healthier and debuted her new hairstyle, which featured a shorter cut and bouncy curls. She even danced with Paddington Bear as Prince William laughed and watched them from the side. Two days later, Prince William, Middleton and Prince Harry attended the We Are Coach Core event at the London stadium to meet the future sports coaches of the country.

What can you say about Prince William, Middleton and Prince Harry's hashtag? Do you support it? Drop a comment below.