Samskara

This amulet is created around the principle that repeating the same action 21 times is believed to gently dissolve an old pattern or begin a new one. According to classical psychological studies, it takes about 21 days of daily practice to establish a new neural pattern, thus access the subconscious.
 
संस्कार Saṃskāra
It means mental impressions, latent traces, conditioning. It is the closest concept to the subconscious in Yoga and Vedānta.
Past experiences leave saṃskāras, they shape behavior, reactions, desires. They operate below conscious awareness.
In yoga psychology, your “subconscious” is essentially the field of saṃskāras.