Isn't it a radical?
Like the left part in
休 代 仕 使
徑 径 行
酒 港 決
抵 提 挺
or the bottom part in
馬 鳴 点 魚
趙 道 通
These ones contain some frequent too
仏 私 至 比 能 筋 策
Or the "roof" ones
余 食 会
Or the right part of these ones
域 我 載 栽
I ask because I read smthg about, but I'm still lookin to figure out how radicals work.
I've just started to study kanji and I'm looking for anything to help me out...