This is the 1765th most frequent Japanese word.
レイ
"レイ" (rei) can mean "zero," "spirit," "courtesy," or be used as a name, depending on context.
Here, "レイ" is used as a proper noun, serving as the name of a person.
レイは学生です。
Rei is a student.
In this sentence, "レイ" refers to a layer or coverage, related to an atmospheric or physical phenomenon.
霧で視界がレイに包まれている。
The fog has enveloped the view with a layer.
"レイ" here is part of a compound representing a specific robot type or model name.