Kangxi Dictionary quoted Zhengzitong to explain: and

Same. It's the same as the hairpin. The hairpin is pronounced as f incarnation, which means the utensils for holding rice and Liang in ancient sacrifices.

Because the above three characters are rare words, they are not included in the general dictionary and are not stored in the computer font, so they cannot be typed with five strokes. If you want to type it out, you can only make words first and then type it.