यमनियमासनप्राणायामप्रत्याहारधारणाध्यानसमाधयोऽष्टावङ्गानि

yama niyama asana pranayama pratyahara dharana dhyana samadhayo’ stavangani

Yama, niyama, asana, pranayama, pratyahara, dharana, dhyana and samadhi are the eight limbs of yoga.

Yoga Sutras of Patanjali, 2.29

yama = forebearances, respect for others
niyama = observances, recommended habits
asana = yoga poses
pranayama = breathwork
pratyahara = withdrawal of the mind from the objects of senses
dharana = focused concentration
dhyana = state of meditation
samadhi = contemplation, completion

The 8 flowers in the drawing are to represent the 8 limbs of yoga.

Here is another post that has more information on the yamas and niyamas.