a minaret
Not all mosques have minarets and even if they do many will not have any Islamic symbol on top of it. However, as a means of tradition a crescent is placed on top of a minaret. This is however totally regardless of religion; Islam.
Muezzin
The tower is called a minaret, and the building is called a mosque or a masjid. The minaret is used by the muezzin, who climbs to the top and announces the beginning of a prayer.
The building is called Mosque (or Masjid) and the tower is called minaret (or Me'zana)
Minaret College was created in 1992.
Minaret-Speaker was created in 1996.
Emin Minaret was created in 1778.
Kėdainiai minaret was created in 1880.
It's called the Minaret.
Mosque with the Spiral Minaret was created in 1550.
Ince Minaret Medrese was created in 1956.