riI

Rii is a term with multiple meanings across different fields. In popular usage, it most often appears as the name of a consumer electronics brand, while in biochemistry it denotes a specific regulatory subunit of a key enzyme. The meaning of Rii depends on context, and there is no single canonical definition.

Rii is a Chinese-origin brand known for compact wireless keyboards, media-remote devices, and related peripherals. The products are marketed for use with personal computers, smart TVs, and media centers, and are commonly sold online around the world. Typical features include 2.4 GHz wireless connectivity via a USB receiver, small form factors, and QWERTY layouts, sometimes with integrated touchpads or multimedia shortcuts. The brand emphasizes affordability and portability, with a wide range of models varying in size, keyboard layout, and build quality.

In biochemistry, RII refers to the regulatory subunit type II of cyclic AMP-dependent protein kinase A (PKA). The holoenzyme consists of two catalytic subunits and two regulatory subunits, which can be of type I (RI) or type II (RII). In human cells, RII is encoded by PRKAR2A and PRKAR2B genes. In the absence of cAMP, RII binds catalytic subunits and inhibits their activity; binding of cAMP releases the catalytic subunits, enabling phosphorylation of substrates. RII-containing holoenzymes contribute to tissue-specific signaling and regulatory diversity in cells.

Other uses: The letters RII or the string "rii" may appear as codes, acronyms, or names in various languages or fields, but these uses are not standardized and depend on context.