Definition: For the reason that; since; due to the fact that.
Another handshape variation is the handshape horizontal "L", palm in.
The sign of this gloss WHY/\ (with the raised eyebrows) is a rhetorical question. This sign is NOT a wh-question as in "why?" (which is accompanied by the eyebrows burrowed down).
The rhetorical question WHY/\ has been much more common. It functions as a conjunction as well as a rhetorical question.
Phonological variation (middle finger instead of the middle three fingers) for this rhetorical question. Video contributed by Calvin Petrowsky (2017).
Related signs: WHY.