The icon is a picture of the logo for Well. The icon has two lengthy upright rectangular structures holding a horizontal spool up. The spool has rope attached to it to hold the bucket up above the well.
This is a Well icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,700 icons, all in the same style and quality.