The term "11 sep staking" is a noun phrase. The core grammatical element is "staking," which functions as a noun (specifically, a gerund derived from the verb "to stake"). The component "11 sep" acts as an adjectival modifier, specifying which instance of staking is being referenced.
In this construction, "staking" names the primary concept or action, which in a financial or blockchain context refers to the process of holding funds in a cryptocurrency wallet to support the operations of a network. The preceding date, "11 sep," functions as a noun adjunct or a proper adjective. Its purpose is to uniquely identify or qualify the noun, distinguishing this specific staking event, program, or period from any other. It answers the question "Which staking?"the one associated with September 11th.
For the purpose of writing, the entire phrase should be treated as a single conceptual unit, similar to a proper noun that names a specific initiative (e.g., "the Apollo Program"). The central subject is the act of staking, and the date provides the specific, defining context. This grammatical structure allows the term to function as a clear subject or object within a sentence, referring to a singular, identifiable event or process.