Not all these icons will appear. The 3 left icons are the fight modes. The fight mode you are currently in will not be displayed.
The red hand icon is the aggressive mode. Aggressive mode will disable parrying and blocking, but you will have other offensive bonuses. It uses the aggressive fighting sub-skill.
The yellow lightning icon is the defense mode. Defensive mode decreases your damage dealt, but you'll have defensive bonuses. It uses the defensive fighting sub-skill.
The blue axe icon is the normal fight mode, and only uses the main fighting skill. Normal fighting mode increases hit rate. It has no special sub-skill.
The icon to the right of the blue axe icon is the shield-bash icon. It will not appear if you do not have a shield equipped on your arm. Clicking this icon will make you try to push your opponent on the ground.