The goddess Akilandeswari is considered to be rowdra swaroopini (one with lots of anger) in the past. So everyone use to worship her from outside. No one dare to go inside her sanctum sanctorum (sannidhi).
Adhi shankara was unhappy with it. He felt so sad on people fearing to go inside the sannidhi of the great mother (sree mAthA). So he designed a "Sri chakram" and "Siva Chakram" and pleaded the mother to let her anger to be flown inside the chakraas as a shakthi and let it be used for the welfare of the living beings. The gracious mother heeded to the words of shankara and shed all her angers and became Shaantha swaroopini (peace and grace showering). Akilandeswari wears the chakras as thadangam on her ears.
Also Adhi shankara, constructed a sannidhi of Lord Ganesha, opposite to Akilandeswari sannidhi. He firmly belived that on seeing her son infront of her, she will forget her old short temperment and will continue to be filled with grace forever. The Ganesha is known as "Prasanna Vinayaka" or Vinayaka who gives smile on everyone's face.
People use to say, while having a darshan of Akilandeswari, if we imagine her face without the thaadangam, we can see the rowdra swaroopam. If we see her face with the thaadangam, we can see the shantha swaroopam.