The "curved" version of the angle brackets (〈 〉). While angle brackets are usually drawn using straight lines, this version is specifically stylized using more curved lines. Angle brackets are used in CJK languages to enclose titles of books.
Etymology
Unicode names for both brackets:
⧼ (LEFT-POINTING CURVED ANGLE BRACKET)
⧽ (RIGHT-POINTING CURVED ANGLE BRACKET)
These are Unicode characters described as the "curved" variety of 〈 〉 (angle brackets).