question #3 Sahih al-Bukhari 494, Book 8, Hadith 141 : What role does a Harba play in the prayer practices of Muslims, especially during travel or on special occasions?

Whenever Allah’s Messenger (ﷺ) came out on `Id day, he used to order that a Harba [??] (a short spear) to be
planted in front of him (as a Sutra for his prayer) and then he used to pray facing it with the people
behind him and used to do the same while on a journey. After the Prophet (ﷺ) , this practice was adopted
by the Muslim rulers (who followed his traditions).