Ef (Ф ф; italics: Ф ф) is a Cyrillic letter, commonly representing the voiceless labiodental fricative /f/, like the pronunciation of ⟨f⟩ in "fill". The Cyrillic letter Ef is romanized as ⟨f⟩.
The Cyrillic letter Ef was derived from the Greek letter Phi (Φ φ). It merged with an eliminated letter Fita (Ѳ) in the Russian alphabet in 1918.
The name of Ef in the Early Cyrillic alphabet is фрьтъ (fr̥tŭ or frĭtŭ), in later Church Slavonic and Russian form it became фертъ (fert).
In the Cyrillic numeral system, Ef has a value of 500.
The Slavic languages practically do not have native words containing /f/; this sound, which did not exist in Proto-Indo-European, arose in Greek and Latin from PIE *bʰ (which yielded Slavic /b/), in some instances in Latin represented historical th-fronting and derived from Proto-Indo-European *dʰ, and in the Germanic languages from PIE *p, which remained unchanged in Slavic. The letter ф is, therefore, almost exclusively found in words of foreign origin, especially Greek (from ph and sometimes from th), Latin, French, German, English, and Turkic.
Ef: A Fairy Tale of the Two (stylized as ef - a fairy tale of the two.) is a two-part Japanese adult visual novel series by Minori for Windows PCs. The first game in the series, Ef: The First Tale, was released on December 22, 2006, and the second game, Ef: The Latter Tale, was released on May 30, 2008. The opening video for the game was animated by Makoto Shinkai, and a majority of the music was produced by Tenmon, who has worked in the past with Shinkai and Minori. Female character design was by Naru Nanao of Da Capo fame, while male character design was by 2C Galore.
Before the release of Ef: The First Tale, a manga based on the overall story was serialized between 2005 and 2015 starting in Dengeki Comic Gao, but later transferred to Dengeki Daioh. In addition, a light novel was serialized in Kadokawa Shoten's Comptiq from July 2006 to July 2008. A 12-episode anime adaptation titled Ef: A Tale of Memories was produced by Shaft and aired between October and December 2007. A second season of the anime titled Ef: A Tale of Melodies aired 12 episodes between October and December 2008.
The Efé are a group of part-time hunter-gatherer people living in the Ituri Rainforest of the Democratic Republic of Congo. In the depths of the forest they do not wear much clothing, using only leaf huts as shelter for their bodies in the intense heat. The Efé are Pygmies, and one of the shortest peoples in the world. The men grow to an average height of 142 cm (4 ft. 8 in.), and women tend to be about 5 cm (2 in.) shorter.
Dr. Jean-Pierre Hallet was very involved with the Efé, from raising awareness to the plight of the tribe, to the introduction of new foods and methods previously unknown (such as a legume called the "winged bean" of New Guinea). He also introduced new methods of farming to the Efé, who likely had been a hunter-gatherer society for many thousands of years.
The Efe pygmies are considered by mitochondrial DNA haplotype analysis to be one of the oldest races on earth. The Semliki harpoon, 90,000 years old, is one of the oldest tools known to mankind and occurs in the natural range of the Efe pygmies. This suggests an initial aquatic civilisation based on fishing. Jean-Pierre Hallet promoted the establishment of a sanctuary for the Efe along the Semliki River near Virunga National Park, and also lobbied heavily for the rights of the semi-nomadic pygmies to continue living in the protected Okapi Wildlife Reserve in the Ituri Forest.