The term "911 buah batu" is a noun phrase. The grammatical head of this phrase is the noun "batu," which means "stone" or "rock." The other components of the phrase serve to quantify and classify this central noun.
A breakdown of the phrase reveals its grammatical structure. "Batu" is the head noun, identifying the object. The number "911" is a cardinal number, functioning as a determiner that specifies quantity. The word "buah" is a numeral classifier, a type of measure word common in languages such as Malay and Indonesian. It is grammatically required to link the number to the countable noun, functioning similarly to "pieces of" or "units of" in English, though it is more integral to the syntax. The complete phrase, therefore, translates to "911 stones" or "911 units of stone."
By determining that the keyword is a noun phrase, the main point for an article is established to be about a specific, tangible, and quantifiable set of objects. The focus is on the things themselvesthe 911 stonesrather than an action (verb) or a quality (adjective). This makes the keyword suitable for topics centered on a physical collection, an archaeological or geological discovery, an inventory, a construction component, or a symbolic grouping where the precise number of stones is a key detail.
