This image of Hanuman is widely popular where he is depicted as supporting a mountain in one hand and a mace in the other. The mace symbolizes strength and is used to destroy evil forces and restore peace and righteousness. The mountain symbolizes Hanuman's ability to overcome insuperable difficulties or obstacles. Folk tales narrate that Lakshmana, Rama's brother, was wounded and needed a particular herb to regain consciousness. Rama asked Hanuman to fetch it, but not being able to recognize the herb, he uprooted the entire mountain and carried it to Rama.
Here he is portrayed as a deity with an ape's face. He wears a short lion cloth (langoti) and is shown with ornaments and a well crafted crown.
The crouching figure he tramples under his left leg represents negative astrological influences. It is believed that worshipping Hanuman removes such influences from our lives.
This description by Kiranjyot.