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These are question marks or interrogation mark

Agriculture in Zhou Dynasty was very intensive and in many cases directed by the government. All farming lands were owned by nobles, who then gave their land to their serfs, similar to European feudalism. ... This way, the government was able to store surplus food and distribute them in times of famine or bad harvest.ReneTheophileHyacintheLa

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Explanation:

Rene Theophile Hyacinthe Laënnec (1781-1826) was a French physician who, in 1816, invented the stethoscope.

Using this new instrument, he investigated the sounds made by the heart and lungs and determined that his diagnoses were supported by the observations made during autopsies.

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