What is 2.0/2.1/5.1 in Soundbars?

Hello,
I am looking to buy a new Soundbar at the budget of around 10000-15000. I am confused between 2-3 soundbars and it is mentioned 2.0/2.1 in the soundbars.
Can I know what does this mean?
I am looking to buy a new Soundbar at the budget of around 10000-15000. I am confused between 2-3 soundbars and it is mentioned 2.0/2.1 in the soundbars.
Can I know what does this mean?
Comments
Game Room HT: Denon AVR-X4200w; Sony UBP-x700; Definitive Technology SM450; Definitive Technology LCR2000; Definitive Technology StudioMonitor350; Mirage Nanasats; Sub - HSU VTF-2 MK5
Master Bedroom
Cambridge Azur 551r; Definitive Technology promonitor 800; ACI Titan Subwoofer
2. JM Labs Electra 920.1; Parasound JC2 and JC5; Sony HAP-Z1ES; Marantz SA8004 SACD; Music Hall MMF7 and Acoustech phono pre; PS Audio P1000; MIT S1 Cables
3. Polk LSiM703; Anthem Pre-2L SE; Parasound A21; Sony 48" 4K TV; Wyred4Sound DAC 2; Oppo 203; Squeezebox Touch; PS Audio Power Director 4.7; MIT S3 cables
http://audiomilitia.proboards.com/
Game Room HT: Denon AVR-X4200w; Sony UBP-x700; Definitive Technology SM450; Definitive Technology LCR2000; Definitive Technology StudioMonitor350; Mirage Nanasats; Sub - HSU VTF-2 MK5
Master Bedroom
Cambridge Azur 551r; Definitive Technology promonitor 800; ACI Titan Subwoofer
I think those amounts were in rupees.