Microsoft, Google and a series of large companies simultaneously dropped the letters A, B, and O in their logos

The scope of this campaign has been extended worldwide with the participation of many locations, organizations and companies from different countries around the world.

British NHS Blood Transplant and Transplant Agency and London Engine Group PR company launched the #MissingType campaign , with 3 letters symbolizing blood groups disappearing from familiar names and brands . The goal of this campaign is to encourage people all over the world to donate blood.

Well-known companies, such as Microsoft, Tesco and Google, as well as the world's iconic landmarks, such as Canada's "Toronto" sign and the Dutch "I amsterdam" are all removed. The letters A, B and O next week to popularize people's perceptions about this campaign.

Toronto's O is changed in color compared to the rest.

Beginning August 16 to August 21, it spreads over 21 countries and gathers 25 blood transfusion agencies around the world. Countries participating in this campaign include: USA, Australia, Singapore, Canada, South Africa and Ireland.

"Without A, O and B, we are just nowhere. Help fill in the blank", is the promotional message for this program.

The letter A in "I amsterdam" is turned into squares.

This launch marks the second time the British NHS Blood Transfusion and Transplant Agency operates the #MissingType campaign, but this is the first time this campaign has risen globally. Previously, despite the encouragement of international organizations, most of the participating units were still branches of companies and organizations based in the UK.

The global scope of the campaign is striking with staggering statistics: the amount of donated blood worldwide has witnessed a 30% decline compared to the previous decade.

The letter O in Tesco's name and Microsoft has been removed or blurred to support this campaign.

According to WHO, only about 33 out of every 1,000 people in high-income countries participate in blood donation. In middle-income countries, this number drops to only 12 per 1,000 people. Blood donation rates are even lower in low-income countries, where only 5 out of 1,000 people donate blood.

About 74 countries collected more than 90% of the blood provided by volunteers who donated blood without compensation.

The letter B and O in the Xbox One are not temporarily deleted.

The call to strengthen blood donation comes at a time when conditions that restrict people who are eligible to donate blood are being carefully considered around the world. Some people blame the decline in blood donations due to emerging trends such as tattooing and international travel, factors that may cause donors to back off their blood donation a year in the United States.

The campaign also came at a time when gay men were protesting against regulations in many parts of the world to actively prevent them from participating in blood donation due to homosexual sex.

The Google logo also removed 2 O.

Social media users can follow this campaign with hashtag #MissingType on all social networking platforms. The NHS Transfusion and Transplant Agency also encourages the participation of individuals, when asking supporters to remove letters A, B and O from their names on Twitter, Facebook and Instagram. To find out how to donate blood, you can come here if you are in the UK, here if you are in the US and here to find out information about blood donation in other countries.