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Regarding this, what does left indicator mean?

Using the 'left-indicator' would mean that he is going to stay on the left side of the road and the vehicle intending to overtake can do so from right. When you talk, you are only repeating what you already know.

Furthermore, do you indicate going straight roundabout? Before entering a roundabout you must indicate if you are intending to exit left or right (if going straight ahead, don't indicate on entry). You must give way to all traffic that will cross your path from your right as you enter the roundabout.

Also know, what does left turn only sign mean?

Turn Left Only Traffic Sign When you are traveling in the lane marked with this road sign, you know that you are in a dedicated turn lane and you are only allowed to travel in the direction the arrow is pointing in. Left turns only are allowed from the lane displaying this sign.

When you are about to exit a roundabout should you give a left signal?

When approaching a single-lane roundabout, you must decide which exit you want to leave by: if you intend to turn left (leave before you are half way round), you must give a change of direction signal to your left as you approach.