To identify a unilateral element, it's helpful to understand what "unilateral" means in different contexts. Generally, "unilateral" refers to something that involves or is done by only one side or party, without the involvement of others.
In the context of elements, particularly in fields like chemistry or physics, the term isn't typically used. However, if you're referring to concepts in other areas such as legal agreements, economics, or certain mathematical or scientific contexts, "unilateral" could be used to describe actions or principles that are one-sided or not reciprocal.
If you have a specific list or context in mind for the unilateral element you're asking about, please provide more details. That way, I can give a more accurate and relevant explanation!