What do the abreveations and numbers on strongs concordence mean?

qahal {kaw-hawl’}
from
6950; TWOT – 1991a; n m

AV – congregation 86, assembly 17, company 17, multitude 3; 123

1) assembly, company, congregation, convocation
1a) assembly
1a1) for evil counsel, war or invasion, religious purposes
1b) company (of returning exiles)
1c) congregation
1c1) as organised body