(2) A symbol of (male) sexuality.
(3) A symbol of fertility. As such, it may signify - particularly for a woman - that it is time to give some hitherto unused part of your psyche an active role in your conscious life.
(4) A black cock is traditionally a symbol of evil. Bear in mind that ‘evil’ aspects of you are potentially creative and are dangerous only if you keep on pushing them aside.
(5) A weathercock (e.g. on a church spire) may have something to do with finding a new direction in life. Alternatively, the combination of spire and cock may be a strong sexual symbol - particularly in a woman’s dream.