Why is the logo of HP computer HP, but the icon of notebook is not HP? But a square icon?

Generally, hp notebooks are divided into HP or compaq(C) logo.

Note: the serial number S/N and the product number P/N can generally be found on the label or warranty card on the back of the machine (or in the battery compartment of the notebook), and the P/N number is generally in the form of #AB2. Serial number is a set of letters and numbers with 10 bits.

This logo is the logo of Compaq notebooks in HP notebooks, which is a normal phenomenon.

(As shown below) The first two are HP, and the last two are compaq, a notebook brand acquired by HP.