Assuming you mean her underwater suit, it's an acorn, though it wasn't there in early episodes.
Sandy's suit has a picture of an acorn.
Sandy is Spongebob's friend, not his 'girlfriend'.
SpongeBob and Sandy aren't getting married
Sandy is from Texas.
That Would Be Pearl, Remember That Time Where Spongebob And Pearl Were On The Prom. Sandy Does Not Have Any Dates With Spongebob And The Wedding Of Spongebob And Sandy Was Just A Play, They Were Not Really Married. Although Still, Pearl Saved Sandy's Life.
When Spongebob is jelly-fishing he saw Sandy Clam Wrestling then Spongebob said tries to Sandy and Sandy came out of the clam then Sandy saw Spongebob then Spongebob is stuck inside a clam then Sandy rescues Spongebob and that's the time they meet.ummmmmmmmmmm
sandy because she loves spongebob
Sandy, SpongeBob, Squidward & Patrick
sandy in bikinibottom plays with spongebob
Sandy Cheeks
Sandy is 25. Her birthday is in November. Incedentally, SpongeBob and Patrick are 23.
A Squirrel