Ha is short for Handelsbeurs - the name we were given when we opened in 2002, referring to the actual trade fair the building was used for in the early 20th century.
The building has been popularly known as "the Ha" for decades - which is why you can also have lunch or dinner in the "Brasserie Ha". A name change for the concert hall followed in 2022. Back to its roots, back to the Ha (pronounced like aHa!).