The logo you are talking about is the emblem of the World Health Organization

The emblem of the World Health Organization was selected by the First World Health Assembly in 1948. The emblem consists of the United Nations symbol covered by a snake coiled scepter. For a long time, the scepter coiled by a snake has been a symbol of medicine and the medical profession. It originates from the story of Aescolapius, who was revered by the ancient Greeks as a god of medicine and whose worship involved the use of snakes. (As a casual aside, Aescolapius was so successful at saving lives that legend has it that Hades, the king of hell, complained about him to the supreme god Zeus, who killed Aescolapius with a thunderbolt out of fear that the healer might make people immortal. Lapios. )

Protect the World Health Organization emblem

The World Health Organization emblem forms part of the intellectual property rights of the Organization and may not be used by others without express written permission. Emblem.

In addition to serving as the Organization's identifier, the WHO emblem represents the Organization's official seal. As such, it means that the World Health Organization endorses the materials used in conjunction with it.

The use of the emblem of the World Health Organization is guided by a resolution of the First World Health Assembly, which stipulates that “appropriate measures shall be taken to prevent the use of the emblem of the World Health Organization without the approval of the Director-General. Formal seals and names, as well as abbreviations of names spelled out with initials, shall in particular be prevented from being used for commercial purposes through trademarks or commercial insignias”. In most WHO Member States, legislation has subsequently been adopted to protect the Organization's emblem, seal and name. It also protects the WHO emblem, name and abbreviation from being registered as trademarks under Article 6 of the Paris Convention for the Protection of Industrial Property.

Use of the World Health Organization emblem in publications

As the use of the World Health Organization emblem implies endorsement by the World Health Organization, if the World Health Organization was involved in preparing the text or funding the publication ( or work on which it has been based) and may be used for publication (print, electronic or online) only with express permission, provided that the text is consistent with WHO policies and priorities. The WHO emblem should not be used in conjunction with advertising or proprietary product names.

It is generally inappropriate to use the WHO emblem as an illustration (for example, in a magazine article about the World Health Organization), given that some readers may interpret it as a sign of approval. Journalists and other authors are encouraged to use other illustrations (such as photographs) to draw attention to the work of the World Health Organization. Likewise, the use of the WHO emblem on non-WHO websites is generally not permitted because its use could be misconstrued as WHO endorsement of the non-WHO website.

WHO program logos

In addition to the WHO emblem, which represents the WHO as an organization, some WHO programs and projects have their own logos used to identify their activities. The use of these logos is limited to the relevant program or project. Where programs involve collaboration between WHO and other agencies, requests for use of the logo should be made to the Program Director at permissions@who.int. Use of WHO program and project logos does not imply approval or endorsement by WHO.

Related links http://www.who.int/about/licensing/emblem/zh/index.html