Which is a landmark case that to clarify the limits of freedom of personal symbolic expression (wearing of armbands to protest the war) in the school setting?

Tinker vs Des Moines Independent School District is the landmark case regarding the First Amendment of Freedom of Speech and Expression. Some students were suspended for wearing black armbands protesting the Vietnam War. The Supreme Court said the constitutional rights do not cease when you enter school. However, the freedom of speech and expression must not become disruptive nor invade the rights of others.