Confusion with some Tags


I know I’m sounding a bit stupid, but please bear with me. I’m new here.

I was trying to clean the exported data of my area (Kolkata, India). Now I’m in a fix with some tags. Can anyone help me with them?

What does ‘AND_a_c’ = ‘10001023’ mean in

Any help is appreciated. Thanks in advance.

Query expanded further on the osm help site.