What is Nishan Sahib? It’s found flying atop every gurdwara

Was a Khalistani flag hoisted at Red Fort? No, it was a Sikh flag which is found in every gurdwara and people carry it almost invariably during religious processions. In gurdwaras, it is hoisted at a height with a ‘khanda’ (a doubleedged sword). The flag flies at the top of this and is called Nishan Sahib.
The type of flag that was fixed atop the pole in Red Fort is usually carried atop vehicles when people go for religious processions or even for religio-political gatherings, or during any movement.
Sikh flag in the Indian Army
Nishan Sahib aka the ‘Sikh flag’ is there at every gurdwara of the Sikh Regiment. When the contingents of the regiment move their gurdwara, they also carry the Sikh Flag along the ‘bir’ of Guru Granth Sahib and it is treated with great respect by officers and jawans. Nishan Sahib is found at every gurdwara in any Army cantonment.
The war cry of Sikh Regiment and Sikh Light Infantry is the Sikh war cry, ‘Bole So Nihal, Sat Sri Akal’. Motto of the Sikh Regiment is ‘Nischay Kar Apni Jeet Karoon (With determination, I will be triumphant) which is taken from a hymn by Guru Gobind Singh. The regimental motto of the Sikh Light Infantry is ‘Deg Teg Fateh (prosperity in peace, victory in war)’. Protesters also raised the slogans of ‘Bole So Nihal Sat Sri Akal’ throughout the tractor march and also at the Red Fort.
Was the Tricolour removed at Red Fort?
No, the videos of the incident make it abundantly clear the ‘Sikh flag’ was mounted on an empty pole and no one touched the Tricolour. Some protesters were even carrying Tricolours along with Sikh flags and flags of the farmers’ unions.