Actually, it is for master's and doctorate degrees, not for associate or bachelor degrees. However, some individuals are proud of what they have accomplished and thus indicate the abbreviation after their name.
BA
BA.
In college a BA is a bachelors degree of arts. A BS is a bachelors degree in science. Most students get a BA.
BS
A BA is a bachelor of arts degree, a BS is a bachelor of science degree. Both take four years to earn.
BA
you are bs
BA and BS
BA is a Bachelor of Arts. BS is a Bachelor of Science. They are both three to five year degrees.
You would indicate BS after your name. That being said, with a Bachelors degree, there is usually no reference to it after a name. Degrees that are Masters and above are indicated. To some individuals placing BA or BS after a name may appear peculiar or even inappropriate.
BS stands for Bachelor of Science as opposed to BA which stands for Bachelor of Arts
Typically at the bachelors level it is a bachelors of science (BS).