The Chinese brand Android I'm using now (Huawei Y3 (2018) has a power/standby button, with a rough surface.
I enjoy being able to identify it or distinguish from volume rocker/switch using touch, since that sports a smooth feel surface.
I'm unsure if the BB Android devices pioneered this element to distinguish the power/standby button, before other brands did it.
Do more brands have it too, like this Huawei?