Any number of shares less than the minimum board lot is considered as ODD LOT. Odd lots are traded at an Odd Lot board which are usually traded at a different price than the mainlot board. You can enter odd lot orders by choosing the ODDLOT button on the order details box.
Please note that odd lot orders can only be DAY orders, not GTC or ATC orders, which means you'll have to place your odd lot sell order again the next day if it is not matched today.