Answer:

chi

Answer	Crossword Clue
CHI	Fraternity letter
CHI	Greek X
CHI	Sox city

CHI	The Windy City, briefly
CHI	Life force, to an acupuncturist
CHI	Greek letter
CHI	Nelson Algren's city, for short
CHI	Tai ...
CHI	Greek mythological creature that breathes fire
CHI	Feng shui force
CHI	X, to Xenophon

CHI	Actor McBride
CHI	McBride of Pushing Daisies
CHI	Between xi and eta
CHI	Force in acupuncture
CHI	Windy City, for short
CHI	Energy, in feng shui
CHI	Greek consonant
CHI	Where els run

CHI	"The Sweetheart of Sigma .."
CHI	...-square test
CHI	Christogram letter
CHI	Acupuncture force
CHI	T'ai ...
CHI	The Cubs, on scoreboards
CHI	Wrigley Field scoreboard abbr.
CHI	Bulls' town: Abbr.

CHI	McBride of "Boston Public"
CHI	T'ai ..
CHI	"The Sweetheart of Sigma .." (1912 song)
CHI	Vital life force, in acupuncture
CHI	Actor McBride of "The Nine"
CHI	Ho .. Minh
CHI	Sox home, on scoreboards
CHI	Sox lead-in

CHI	The Bears, on scoreboards
CHI	X, to Hippocrates
CHI	X, to Xanthippe
CHI	Vital force in Chinese medicine
CHI	Cubs, on scoreboards