Master Icon in iPhone Style

This is a Master 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 12,300 icons, all in the same style and quality.
This is a picture of a square with a line going through the bottom of it, horizontally. On the upper part, there is a crown with a line under the crown, and on the bottom, there is a black dot.

Related to Master Icon

Related icons are the icons with matching tags, as well as all computer hardware icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors

Idea of Master Icon by Piet Jacobs

We've received the idea on August 28, 2013 and created the icons on September 23, 2013

Master/Slave, Client/Server, Broadcast, Unicast, Multicast (5 icons)

From a Digital Electronics background perspective there are digital components, like the JK Flip Flop, or the D Flip Flop, which implement a Master-Slave principle. In the computing world another term used to indicate the master/slave principle is server/client. If you want to describe by means of iconification the Master/Slave principle, how would you iconify this?

I've been thinking about it, but I can't seem to design such icons to indicate wether a machine or component is acting as a master or as a slave. Besides that: you can have multiple masters and multiple slaves. For example: three masters and ten slaves. Each master waits for his turn to use the databus, while the slaves follow the master to which they have a corresponding relation (mostly an ID or bitregister). It goes too deep to start lecturing about master/slave, but my goal is to have two icons showing that "the thing" is either a master or a slave. I don't mean client or server icons! Another important thing is the communication of the master/slave principle. Does the master broadcast? unicast? or multicast? It's all related, not only within the digital electronics world, but also in the computing world.

​More background info here:

Please feel free to come up with any good icons for master and slave. I think it is a design challege, because I can't figure out how on earth you symbolize these meanings. Icons for unicast, multicast and broadcast are welcome too, because they visualize the communication between the master and slave. Thank you for your design skills, I wish I had these too.