There is no such country or state as Columbia. If you mean Colombia, click here. If you mean British Columbia, click here. If you mean the District of Columbia, click here. There are also about 40 cities in the world with the name "Columbia" in it.
The abbreviation "DC" is postponed to "Washington" for two important resasons: [i] for locative indication of "District of Columbia"; and [ii] to distinguish Washington Sate of Washington City, the 42nd of the United Satate.
There are lots of symbols, and they all have their own meaning. What symbol do you mean? Anything other than letters of the alphabet is a symbol. @ is a symbol, officially known as the ampersand, standing for the word "at".
This question doesn't have an answer, because Columbia isn't a state. If you mean Washington DC (District of Columbia, and the capital of the USA), there are several different animals. If you mean Colombia, the country in South America, the state animal is a Condor.