I think we're all familiar with the concept of syntactic elements that are opened and closed, and can be nested in some cases.
Examples:
- (), [], {}, <> et. al.
- Parenthetic clauses, such as this one, which fall within a sentence
- Quotation marks: "a direct quote" and 'another'
Programmers will also be familiar with examples from formal languages such as HTML tags: <p> This is a paragraph element </p>
. Indentation often also often manifests this concept in programming languages.
There are also more abstract examples such as adverts on television that are split into two parts, and "frame" a portion of content (for example part 1 asks a question, part 2 answers it later).
Is there a name for this? "Parenthesis" covers a lot of it, but it doesn't really include quotation marks, nested formal language constructs (like HTML tags), or totally abstract examples like TV ads. Also, the "parenthesis" in a parenthetic clause refers to the contained element ("such as this one"), not the containing element ("Parenthetic clauses ... which fall within a sentence").