What kind of stone is this? There are words on it.

This is Mani Si Tong. You can often see piles of mani piles when you go to the west. Tibetan compatriots pray. The above is Tibetan, and I don't understand the specific meaning. Formerly known as "Ma Zhishi". This is based on the eight-character mantra "Om. Ma Zhimou is the "yes" of Tathagata Heart Mantra III, and the word "Ma Zhi" is added in front of it. "Ma Zhishi" is a traditional custom handed down from the ancient elephant era. Many customs and lifestyles of modern Tibetan compatriots, such as weddings, funerals, astronomical calendars, medical literature, song and dance paintings, choosing houses for tourism, choosing auspicious dates, exorcising evil spirits, and divination, etc. To some extent, it still follows the ancient tradition of Yong Zhong Benjiao. There are many unique ways for Tibetan compatriots to pray for blessings, such as turning to the sacred mountain, worshiping the sacred lake, laying the wind horse flag, hanging colorful flags, carving stone scriptures, putting mani piles, playing divination, offering sacrifices to horses, butter sculptures and even using prayer wheels. These are also the heritage of this religion in Xiong Yong, an ancient elephant.