Identification 22 Orchids 15 Islam 11 Moon 11 Observations 11 Religious aspects 11 Mathematics 8 Pictorial works 8 Study and teaching 8 Varieties 8 Fasts and feasts 7 Environmental aspects 6 Ecology 5 Rising and setting 5 Stick insects 5 Arithmetic 4 Botany 4 Calendar, Islamic 4 Conservation 4 Dendrobium 4 Geology 4 Mammals 4 Marine ecology 4 Rain forests 4 Wildlife conservation 4 Biotic communities 3 Birds 3 Calendar, Islam 3 Classification 3 Earthquakes 3