Language:
More than 98% of Bangladeshis speak Bengali as their mother tongue as it is the official language. It is an Indo-Aryan language of Sanskrit origin with its own script . English is used as a second language among the middle and upper classes. English is also widely used in higher education and the legal system. Historically, laws were written in English and were not translated into Bengali until 1987 when the procedure was reversed. Some Dhakaiyas (Locales of Dhaka) & the Bihari population speaks Urdu , which was also the language associated with the government prior to separation from Pakistan.

Note: Shaheed Minar of Dhaka, as rebuilt in 1972 , It is the central Shaheed Minar in Bangladesh.
The Shaheed Minar ( Bengali : শহীদ মিনার Shohid Minar lit. "Martyr Monument") is a national monument in Dhaka , Bangladesh , established to commemorate those killed during the Bengali Language Movement demonstrations of 1952.
On February 21, 1952, dozens of students and political activists were killed when the Pakistani police force opened fire on Bengali protesters who were demanding equal status for their native tongue, Bengali . The massacre occurred near Dhaka Medical College and Ramna Park in Dhaka. A makeshift monument was erected on February 23 by students of University of Dhaka and other educational institutions, but soon demolished on February 26 by the Pakistani police force.
The Language Movement gained momentum, and after a long struggle, Bengali was given equal status with Urdu . To commemorate the dead, the Shaheed Minar was designed and built by Hamidur Rahman , a Bangladeshi sculptor. The monument stood until the Bangladesh Liberation War in 1971, when it was demolished completely during Operation Searchlight . After Bangladesh gained independence, it was rebuilt.
At present, all national, mourning, cultural and other activities held each year, regarding 21 February, have been centered around the Shaheed Minar.