Square micrometer (um²)
Definition: Square micrometer (symbol: um²) na area wey be like square wey each side na 1 micrometer. E mean say na one trillionth of one square meter.
History/origin: Square micrometer follow come out as part of metric system as microscopy, semiconductor manufacturing, and materials science begin need correct way to talk about very tiny surface area.
Current use: Dem dey use square micrometer for microelectronics, cell biology, thin‑film science, and materials engineering to describe very small surfaces and cross‑sections.