Sagi,
It's software... there has to be a way to add a 6th icon. We have already invoked a custom field called "On Hold" with a Yes/No check mark. Yes, we can add that to the cards. An "On Hold" icon (just like the "Ready to Pull" icon) would just be a more elegant and visually striking way to do it. The use case is that many teams will have multiple items in a column of the Kanban, but some of them are not being worked on... they are "On Hold". So, they want a way to easily mark then in that state.