What does .C stand for?

What does .C mean?

C	Cult Community » Religion
C	Consequence Academic & Science » Mathematics
C	Climbing Academic & Science » Botany
C	Cholesterol Medical » Physiology
C	Consistency Miscellaneous » Food
C	Chrysler Business » Firms
C	Calibration Business » Products
C	Celtic Regional » Countries
C	Civilization Community » Media
C	Creativity Community » Educational
C	Courage Governmental » Military
C	Concurrent Academic & Science » Mathematics
C	Comma Miscellaneous
C	Conviction Community » Law
C	Counted Governmental » US Government
C	Compromise Governmental » Politics
C	Controversy Governmental » Politics
C	Communism Governmental » US Government
C	Controversial Community » Media
C	Citrus Miscellaneous » Food
C	Celsius Medical » Physiology
C	Calorie Miscellaneous » Unit Measures
C	Clarification Community » Media
C	Concise Community » Media
C	Constituent Governmental » Politics