Related Clues:

• Letter shaped like a P
• Existential life force
• Vital life force, in acupuncture
• Letter between pi and sigma
• Greek letter that looks like a "P"
• Third-to-last Greek letter
• N.L. and A.L. city
• ___-town (the Windy City)
• Symbol for density
• X, to Hippocrates
• Tai __
• Ill. metropolis
• Letter after pi
• N.L. Central team, on scoreboards
• Sox lead-in