sono
1.

A term used to refer to something or someone that is perceived as being closer to the listener than to the speaker, often indicating familiarity or relevance to the listener's perspective.

2.

Used to reference matters that have been previously mentioned or are mutually understood between the speaker and the listener, signaling a shared context.

3.

Employed as a filler word in conversation, particularly when the speaker is hesitating or searching for the right words.

4.

Indicates a vague or unspecified idea, often used to suggest a general location or situation without pinpointing something exact.

Example:

毎日、放課後に私はその本屋で彼女を待った。