“的符号”造句

改动作曲家原有的符号是亵渎行为。
It would be sacrilege to alter the composer's original markings.

老师用数字或字母的符号来评价学生的作业.
By marks in numbers or letters, the teacher evaluates a student's work.

这个奇怪的符号象征什么?
What does this strange mark symbolise?