Rank Points
Rank Points are a way of tracking your progress towards your next Home Nation rank. There are no numeric value for Rank Points, rather a bar that can be seen under the "Status > Profile" menu as shown below.
Upon filling the bar, though, players do not automatically rank up like Experience Points. The higher the bar the more missions for that rank a player can access.
Trading Crystals to a Conquest NPC will increase this bar quickly and substantially. Additionally, completing other rank missions will also increase it.