It's a logo of a scuba mask on top of a nose and a breathing apparatus. The mask is a longer rectangle with curved edges and a long bottom than top with a triangular section cut out of the bottom middle and a nose coming out there. Below the nose is a circle with a dot inside and a line extending to the right.
This is a Scuba Mask 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.