It's an icon that is a message balloon. It is a message balloon like they use in cartoons in newspapers or magazines. It has an arrow pointing to the right inside of the balloon.
This Topic Moved icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 5,700 icons, all in the same style and quality.