The “sharpest” knife 刀 in Chinese

刀 dāo is mostly turned into刂 to express different acts with a knife, or other concepts related to knife. So for knife-related meanings, you will see in most cases characters with刂 but not with 刀. 

Tips: characters with刂 are mainly phonetic left-semantic right, such as 肖xiāo +刂 = 削xiāo, 朵duǒ +刂 = 剁duò.

They have the exactly same pronunciation as that of 平

The component 平平 is so loyal!

All these characters with the component 平 are pronounced the same as 平 píng. As for their meanings, just check the semantic parts, e.g 枰 = 木 + 平(枰, a kind of tree),鲆 = 鱼 + 平(鲆, a kind of fish).