Metroid Dread is filled with power-ups and upgrades to unlock and numerous enemies and bosses to battle. These are essential for progressing through the game. While most collectibles are revealed upon picking them up, there is one that isn't.
Eventually, you will stumble upon an unknown resource. Upon collecting this, the player is told that it is an unknown resource and they cannot do anything with it yet. They can still pick it up even though they cannot use it. You might be wondering what this is.
This unknown resource is simply ammo for the Super Bomb ability. You have not acquired this ability yet, so you cannot use or identify the resource at this point in the game. Upon unlocking the Super Bomb ability, the resource will be added to your ammunition. So, for now, just collect this unknown resource until you can use it.
Having additional ammo for the Super Bomb is a great feature as it is a powerful weapon and necessary for clearing some paths. Collecting more ammo for this ability means that you can use it more often and without fear of running out. So keep your eyes peeled and do future you a favor and collect this unknown resource.