頭陀  / tóu tuó /
Itinerant Monks 
Description:
頭陀苦行、清貧生活,長養道心,振三毒垢。
Itinerant monks practice austerities and live humbly
to foster a mind of cultivation and to eliminate the Three Poisons.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
高雄市大樹區興田里興田路 153 號
886-7-6561921 #2501-2506