P4 may refer to:

Computing

* Intel Pentium 4, a 7th-generation processor design ** The P4 power connector introduced to power it and later CPUs in the ATX12V 1.0 standard * The i486DX (P4) model of the

Intel 80486 The Intel 486, officially named i486 and also known as 80486, is a microprocessor. It is a higher-performance follow-up to the Intel 386. The i486 was introduced in 1989. It represents the fourth generation of binary compatible CPUs following the ...

, a high-performance microprocessor * P4 (programming language), for describing packet forwarding * P4, the Perforce software command line client

Media

* P4 Radio Hele Norge (PFI), a Norwegian radio company ** Kanal 24 (Kanal 4), which acquired the Norwegian P4 channel from PFI * Sveriges Radio P4, a Swedish radio channel * '' Persona 4'', a 2008 video game * '' Periphery IV: Hail Stan'', 2019 album by American progressive metal band Periphery

Military

* Skaraborg Regiment (armoured), a Swedish army unit whose designation is P 4 * Peugeot P4, a vehicle used by the French Military

Science

* P4 laboratory, a biosafety level 4 facility * Tetraphosphorus (P₄), an allotrope of phosphorus * Group p4, the plane symmetry group Wallpaper group p4 *

Progesterone Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens and is the m ...

(Pregn-4-ene-3,20-dione), a steroid hormone * Kerberos, the fourth moon of Pluto * Perfect fourth, an interval in music theory *

Enterobacteria phage P4 ''Enterobacteria phage P4'' (also known as satellite phage P4) is a temperate bacteriophage strain of species ''Escherichia virus P2'' within genus ''Peduovirus'' (formerly ''P2-like viruses'', ''P2virus'', and ''P2likevirus''), subfamily ''Peduo ...

* P4, an EEG electrode site according to the 10-20 system * P4 cell, a stage in the ''Caenorhabditis elegans'' embryonic development * P4 metric - performance metric of the binary classifier.

Roads

* P4 road (Latvia) * P04 road (Ukraine)

Other uses