九つ

1. Origins, structure, and basic meaning

• Structure: 九つ is read as ここのつ and is a native Japanese counting expression meaning nine items or units.
• Basic usage: Independent counting appears in みかんが九つ, while noun modification appears in 九つの質問.

2. Common pitfalls and similar expressions

• Reading of 九
  • The character 九 also has readings such as きゅう and く, but this native counting form is ここのつ.
• General-purpose counting
  • It counts many kinds of objects or items, while categories such as people use dedicated counters.