What is the abbreviation for Parent-Teacher Organization?

The abbreviation for Parent-Teacher Organization is indeed represented as "PTO." This acronym reflects the structure and purpose of the organization, which aims to foster collaboration between parents and teachers to enhance the educational experience for students.

In contrast, "PTA" stands for Parent-Teacher Association, which is a specific type of parent-teacher organization that may have additional formalities or a national affiliation. "PTS" and "PTE" do not relate to the common terms used for parent-teacher groups in educational settings, as they do not accurately reflect the full meaning of the collaboration between parents and teachers.

Therefore, "PTO" is the correct abbreviation because it is widely recognized and accepted to describe organizations that encourage parental involvement in school activities and support teachers in their educational goals.