the ∇ operator in vector calculus

• also used for ∂ in partial differentiation

向量分析中的 ∇ 运算符

• 也用于表示偏导符号 ∂

abbreviation of delete

• remove a file, character, or entry

删除的缩写

• 移除文件、字符或条目

keyboard abbreviation for the Delete key

• a key that deletes forward, unlike Backspace

键盘上 Delete（删除）键的缩写

• 该键向右删除，与退格键不同