天眼

Etymology
or.

Noun

 * 1)  divine eye
 * 2)  closed-circuit television; surveillance camera

Etymology 1
From.

Noun

 * 1)  heavenly sight by heavenly beings
 * 2)  short for : knowledge of others' karma: one of the six kinds of  or “direct knowledge”

Etymology 2
The literal sense and  sense are likely a coinage within Japanese based on -derived elements  +.

The Buddhist sense is likely a sound shift from tengen above, adopting the kan'on reading of gan for the character.

Noun

 * 1) the eye of the emperor or imperial prince
 * 2)  sight of something not usually visible to the naked eye