The leader of Sikhism is Guru Gobind Singh Ji.
Supreme leader of Sikhism is the Guru Granth Sahib. Guru Grant Sahib is a holy book, and it is the final Guru (teacher) of the Sikh religion. The first ten Gurus, along with the 1st Guru (Guru Nanak) the founder of Sikhism, were people. And since the death of the 10th Guru (Guru Gobind Singh), the holy book Guru Granth Sahib is considered as the only Guru/teacher of the Sikh religion, since Sikhism doesn't have priests - everyone is equal.
sikhism
There is no holy symbol in Sikhism. Khanda is the religious symbol in Sikhism. Please refer to this link: http://en.wikipedia.org/wiki/Khanda_(religious_symbol)
There is no leader of Sikhism currently. But Sikhs call their leaders "Guru". The first Guru who formed Sikhism was called Guru Nanak
A bhagat is a holy man in Sikhism or Hinduism.
Sikh Gurus
Guru Gobind Singh Ji wrote "Guru Granth Sahib Ji"- holy book of sikhism.
guru granth sahib
Guru Granth Sahib Ji
That name means HOLY WATER
The holy scripture of Sikhism is Guru Granth Sahib Ji.Please not that outside Sikhism the sacred writing is called Holy Scripture but within Sikhism it is not seen as holy scripture but is treated as living embodiment of Sikh Gurus and as such treated as a Guru.