| Optical mark recognition | ����� ��� ������ |
| Optical page reader | ����� ���� ��� |
| Optical printer | ���� �ꢲ���� |
| Optical reader wand | ����� �袰� ���� |
| Optical recognition device | ���� ��� ���� |
| Optical resolution | ����� ����� |
| Optimal merge tree | ���� ���� ��� |
| Optimising compiler | ��� ��� |
| Optimum programming | ��� ������� |
| Optimum tree search | ��� ��� ����� |
| Opto electronics | ���� ���������� |
| OR operator | ����� �������� |
| Order of operation | ������좴 ��� |
| Organisation Chart | ���� ������� |
| Organisational control | ����� �좴�� |
| Organise Favourites | ����� �颰� |
| Organization, file | ��� ܬ�𢹺�� | |