等级标志的英文：
grade mark

grade是什么意思：
n. 年级；阶段；等级
v. 将…按级别分类；给…批分数，改作业；混合

longitudinal grade
纵坡度

There are lots of jobs in junior grades.
初级阶段有很多工作要做。

Red grades into pink.
红色逐渐变成粉红色。

The teachers are grading the papers.
老师们正在给卷子打分数。

Pencils are graded according to softness.
铅笔根据硬度分类。

mark是什么意思：
n. 符号；记号；分数，成绩；污点；迹象
v. 做记号；做标记；表明方位；标志；庆祝

Marking: Every package shall be marked with “SM” in diamond and marked the package number.
麦头每件包装应刷上菱形图案内有二字,并应刷上件号

impress a mark on [ upon ] a surface=impress a surface with a mark
在表面上打记号

To mark or mottle with spots.
有斑点，成斑驳用点作标记或使斑驳杂色

mark one's cross
画押，画十字

Rogers was first off the mark.
罗杰斯第一个偏离原定方针。