Each Chinese province has a character which serves as its abbreviation. For example, the abbreviation for Hunan is 湘 (xiang1). Usually this character serves as the symbol for that province's cuisine as well. The character used to denote "cuisine" is 菜 (cai4). Therefore, Hunan food is commonly referred to as 湘菜 (xiang1 cai4). The following is a list of common subdivisons of Chinese food and the characters which are associated with them.

yue4 Guangdong (Cantonese) sweet, closest thing to American Chinese
min2 Fujian sweet, lots of seafood
chuan1 Sichuan (Szechuan) spicy, oily
xiang1 Hunan spicy
gan4 Jingxi spicy
gang1 Hong Kong East meets West fusion, similar to Cantonese
ao4 Macau a little bit of China, a little bit of Portugal
jing1 Beijing  
东北 dong1 bei3 Northeastern lots of meat and dumplings, strong flavors
西北 xi1 bei3 Northwestern noodles, sometimes synonomous with Muslim food
客家 ke4 jia1 Hakka strong flavor, lots of meat
清真 qing1 zhen1 Muslim noodles, mutton, beef, sorry no pork
台湾 tai2 wan4 Taiwan  
西餐 xi1 can1 Western food general term for Western (not Western China) food
中餐 zhong1 can1 Chinese food general term for Chinese food (as opposed to Western)