These terms are not really in use any more. Grands are now simply classified by size.
However, a rough equivalent is:
• 5’8″ or Smaller, Baby Grand
• 5’10” Boudoir Grand
• 6′ (183 cm) Professional Grand
• 6’4″ (193 cm) Drawing room Grand
• 6’8″ – 6’10” (203 – 208 cm) Parlor, Artist, Salon, or Music Room Grand
• 7’4″ (224 cm) Half-Concert or Semi-Concert Grand
• 8’11” (272 cm) and Larger, Concert or Orchestral Concert Grand
Credit to Arthur A. Reblitz’s book Piano Servicing, Tuning and Rebuilding for this list.