It's the term used for Dutch as spoken in Belgium; in it, Antwerp is Antwerpen
The French 
spoken in Belgium is standard but with its own distinctive accent (at least ... and a 
few specialised words, notably the use of septante and nonante for 70 and 90 ... 
the official language of the five northern and north-eastern provinces (Antwerp,... [DOC] [TLE] Language Matters | About Belgium | Beer Tourism [PAR] This has shaped both the country's history and its language, with the result that 
Belgium ... Dutch is the most widely spoken language with 6.1 million native 
speakers, followed by ...