Different ranks.

Academy Member - You have asked to join the clan but you are not generally in the clan yet.

Shinigami - An average roleplayer, you play the part as footsoldier.

Squad Member - A very good rper, you're sent out to fight above average soldiers.

Lieutenant - One of the best in the clan, your skills are to be feared.

Arrancar - A notch up above Lieutenant, you can be called near the best.

Espada - An evolved rank of the best Arrancar.

Captain - One of the Strongest in Soul Society, very hard to beat.

Head Captain - The very best player in the clan.