常常

Why does 常常 look like this?

The character is '常' (cháng) doubled. '常' consists of the '巾' (cloth/turban) radical at the bottom, suggesting a banner or something enduring. The top part '尚' acts as a phonetic component. Together, they represent something that is constant or common, like a standard cloth. When doubled as '常常', it emphasizes regularity.