Which of the following terms is used to describe a symbol representing an idea or organization?

The term that best describes a symbol representing an idea or organization is "emblem." An emblem serves as a visual representation of a broader concept, institution, or belief and often carries a specific meaning associated with the entity it symbolizes. For instance, national flags, logos, and coats of arms are all examples of emblems used to convey identity and values.

In contrast, the other terms do not fit this definition. "Emotional" relates to feelings and sentiments but does not pertain to a symbol. "Embryo" refers to a developing organism, especially at an early stage in development, and is unrelated to symbolism. "Emesis" describes the act of vomiting and has no connection to the concept of representation or organization. Therefore, the correct choice clearly connects to the idea of symbolic representation.