It's a drawing of a spade. The image looks like a spade that you would find on a playing card. The body of the spade is perhaps more prominent than the stem of the spade compared to a conventional spade drawing.
This is a Spades 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.