Nishan Sahib

Nishan Sahib at Sri Harmandir Sahib (Golden Temple), Amritsar""

The Nishan Sahib is a Sikh holy triangular[1] flag made of cotton or silk cloth and is generally triangular in shape, with a tassel at its end. The word, Nishan means symbol, and the flag is hoisted on a tall flagpole, outside most Gurudwaras. The flagpole itself covered with fabric, ends with a two-edged dagger (khanda) on top. The emblem on the flag is known as Khanda, which depicts a double-edged sword called a khanda in the centre, a chakkar which is circular, and flanked by two single-edged swords, or kirpans.
Traditional symbol of the Khalsa Panth, the Nishan Sahib can be seen from far away, signifying the presence of Khalsa in the neighbourhood. It is taken down every Baisakhi, and replaced with a fresh flag, and the flagpole refurbished.
""WaHeGuRu Ji Ka KhAlSa WaHeGuRu Ji Ki FaTeH""

Note out this guys where ever there is going to be sixth grur Sri Guru Hargobindh Sahib JI da gurudwara there are going to be two nishan sahib almost in picture