Idea of Prison Icon
A prison symbol consists of two horizontal lines and two vertical lines that run into each other, similar to a tic-tact toe board. Where the two lines meet, there will be another little line to show that the bars are tightly sealed. A prison is where prisoners are locked away, and would usually have metal bars to keep them inside.
This is a Prison 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 13,900 icons, all in the same style and quality.