What is the schwa vowel sound in iron?

The word "iron" doesn't contain a schwa sound. The vowel sound in "iron" is the long i sound, similar to the vowel sound in "bike" or "time".

A schwa sound (represented by the symbol ə) is a very short, unstressed vowel sound that often occurs in unstressed syllables. It is often described as a "short u" sound, as in the word "about".

There are no unstressed syllables in "iron", so it doesn't have a schwa sound.