Symbol in pronunciation guides

• Sound of the wash swirling round cruiser's port side
• Neutral vowel
• "America" begins and ends with this
• Something found on the eastern end of China?
• Inverted e
• One of two heard in America
• Sound represented by an upside-down "e"
• The "a" sound in "afire"

Wiktionary Word definitions in Wiktionary
n. 1 An indeterminate central vowel sound as the "a" in "'''a'''bout", represented as /ə/ in IPA and /@/ in SAMPA and X-SAMPA. 2 The character ə, an upside-down, backwards, lower-case E

Wikipedia Word definitions in Wikipedia
In linguistics , specifically phonetics and phonology , schwa ( or rarely ) (sometimes spelled shwa ) refers to the mid central vowel sound (rounded or unrounded) in the middle of the vowel chart , denoted by the IPA symbol , or another vowel sound close ...