What are all the brackets for in these posts?

Light Green

Generally, the casual reader can largely ignore these and read the sentence as they would any other sentence.

Deep Green

The VectorLinc Human Responsibility Maturity Model (HRMM) employs an Entity Relationship Attribute (ERA) structure and syntax:

The [Square Brackets], {Squiggly Brackets}, and (Rounded Brackets) are intended to closer bridge the gap between an average American English dialect — in a sentence and an information system database language intended to support the architecture of the model.