(いつ)

いつつ
noun
five (things)
1. five (things)
The native Japanese counter for five objects.
りんご(いつ)ください
Please give me five apples.
I have five questions.
There are five children.
There were five eggs in the box.
There are five questions, so please answer them one by one.

(いつ)つ is the native Japanese (やまとことば) number for five, used when counting general objects without a specific counter.

NATIVE COUNTING SERIES (1-10):

USAGE:
This series is used for counting general objects, abstract things, and when no specific counter applies. It only goes up to 10 — beyond that, use Sino-Japanese numbers with appropriate counters.

AGE:
Also used for age: (いつ)つ means "five years old" (for young children). This usage is common in casual/family contexts.