The great mosque has a tall to mark the building's location and to allow the faithful to be called to prayer by a chanter.

The answer is:

Minaret

Explanation:

The minaret is a tall tower built in mosques with the objective to claim for the prayer's presence, to call their attention. The name "Minaret" means, in a free translation, "thin tower with balconies", and it was introduced for the first time in the 7th century AD.

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