It's a logo for a treatment plan with a clipboard with a paper. The clipboard is rectangular in shape and has a smaller rectangle on top to depict the clip. There is a piece of paper on the clipboard with a plus sign and vertical lines to show writing.
This is a Treatment 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.