45question mark
吗 / 嗎
ma

Radical 口

6 strokes

嗎

mouth 口 (5) + horse 马 (44) = question mark 吗

This is a particle which is added to the end of a sentence to turn it into a question.

Imagine looking inside the mouth of a horse you are thinking of buying, and finding a question mark stamped on the horse’s tongue. / Your robot remarks, “It’s not logical to buy horses at this market.”