He was surprised to learn he offended his friends because in Australia, that a. emblem is an obscene gesture.
Explanation:
An emblem is the pictographic representation of a concept, like a moral truth, a symbol or a person like a king or saint. The emblem is used as a thing of symbolic representation.
The emblem is a representative symbol. It can be a trademark or logo. The emblem can be used as a pattern used to represent the abstract or the person.
The representation of the emblem may vary from one country to another. The emblem recognized by America is considered as an obscene gesture in Australia.