When looking at the field the snake is the term used for the low knee height bunkers that run down one side of the field. (named due to an old supair bunker that looked like a snake!). usually oposite side to these are the tbags/dorito bunkers again named due to there shape.
Basically all bunkers are called there names due to what they look like. Eg Cans, cakes, temples, trees ect however all teams also have there own names for these and if there is more than 1 they will split them up ie Dorito1, dorito 2 ect ect.
All bunkers allong the middle line (left to right) are commonly known as the 50 ie middle of the field.
There is loads more to it and much is team dependent but this will get you started mate.
Hope it helps