What does the crescent moon and tree symbol mean?

Answer 1

The South Carolina State Flag

Asked by the Revolutionary Council of Safety in the fall of 1775 to design a flag for the use of South Carolina troops, Col. William Moultrie chose a blue which matched the color of their uniforms and a crescent which reproduced the silver emblem worn on the front of their caps. The palmetto tree was added later to represent Moultrie's heroic defense of the palmetto-log fort on Sullivan's Island against the attack of the British fleet on June 28, 1776.