1. Shape of charcoals which are; i. Lump shape wood charcoal ii. Stick shape wood charcoal, also called finger charcoal. 2. By their sizes which are i. BBQ charcoal, which is mostly from 40mm downwards ii. Restaurant grade wood charcoal, these are big sizes from 40mm to 200mm iii. Shisha grade wood charcoal. This is always in stick shape and makes use of the best wood. 3. By wood types which are of different types depending on the country; Here in Nigeria, we have, - Ayin wood charcoal as our best wood charcoal - Acacia wood charcoal - Oakwood charcoal - Mahogany wood charcoal - Rosewood charcoal Mixed wood charcoal is a mixture of all of the above.