An arrow pointing to the left, with a curved hook at the other end. Similar in appearance to a sideways U Turn symbol, or a reply icon in an email application.
Right Arrow Curving Left was approved as part of Unicode 1.1 in 1993 under the name “Leftwards Arrow with Hook” and added to Emoji 1.0 in 2015.
U+21A9
U+FE0F
↩️ Leftwards arrow with hook
↩️ Variation selector-16