Ek Onkar, it is the beginning of the Sikh Scripture, where Ek means One and it is written not in words but in figure like "1" Onkar is combination of three words which means creator, sustainer and destroyer. Together, it tells that there is only one who creates, sustains and destroys.
Please refer to this link for the images of this symbol:
http://images.Google.com/images?q=ek%20onkar&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&sa=N&tab=wi
Gurdwara
the religion of khanda is Sikhism !
The sacred building of Sikhism is where the Guru Granth Sahib is kept it is also a place of worship it is called the Gurdwara which means the Gateway to the Guru
Guru Granth Sahib.
Sikhism has a sacred test known as the 'Guru Granth Sahib Ji'
The Sikisham symbol is a sacred religious symbol used in the Sikh faith. It represents the teachings and principles of Sikhism, such as unity, equality, and justice. The symbol consists of a double-edged sword, a circle representing unity, and two curved swords representing spirituality and temporal power.
it is a symbol that represents Sikhism and is very important to them
A Sikh temple is called a Gurdwara.
The sacred book of Sikhism is called the Guru Granth Sahib, not Tohra.
The Khanda is the symbol of the Sikhs.
Guru Granth Sahib is the sacred scripture of Sikhism. It is considered the eternal Guru and contains teachings and hymns of Sikh Gurus and other saints.
By "Hinduism Symbol" I am assuming that you mean the sacred Aum sound, which is found in many Hindu prayers, religious texts, as well as meditation methods. It is also a sacred mantra in other Dharmic religions such as Buddhism, Jainism, and Sikhism, but originated from the Rig-Veda which forms the backbone of modern Hindu culture and practices.