Apex may refer to:
The apex was a cap worn by the flamines and Salii at Rome. The essential part of the apex, to which alone the name properly belonged, was a pointed piece of olive-wood, the base of which was surrounded with a lock of wool. This was worn on the top of the head, and was held there either by fillets only, or, as was more commonly the case, was also fastened by means of two strings or bands, which were called apicula (Festus, s.v.), or offendices (Festus, s.v.), though the latter word is also interpreted to mean a kind of button, by which the strings were fastened under the chin (cf. Serv. ad Virg. Aen. ii.683, viii.664, x.270).
The flamines were forbidden by law to go into public, or even into the open air without the apex (Gellius x.15), and hence we find the expression of alicui apicem dialem imponere used as equivalent to the appointment of a Flamen Dialis (Livy vi.41). Sulpicius was deprived of the priesthood, only because the apex fell from his head whilst he was sacrificing (Valerius Maximus i.1 §5).
In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod.
The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod. The apex is the first-formed, and therefore the oldest, part of the shell.
To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away).
The phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch.
Comparison of the apical part and the whole shell of Otukaia kiheiziebisu:
Where this feature is present, the space under the apex of a patellate or patelliform (limpet-like) gastropod shell is called the apical cavity.
ARCA or Arca may refer to:
Alejandro Ghersi, better known by his stage name Arca, is a Venezuelan record producer, consultant, mixing engineer and DJ based in Dalston, London.
Arca was born in 1990 in Caracas, Venezuela into a wealthy family. His father was an investment banker and his mother studied International Studies. His family moved to Connecticut for a time, before returning to live in a gated community, where he was privately educated and had the luxury of piano lessons. He describes his childhood as “kind of in a bubble”, and had difficulty accepting the fact that he was gay. He later attended the Clive Davis Institute of Recorded Music at NYU.
In 2012, he released three EPs on the UNO NYC label: his debut as Arca, Barón Libre,Stretch 1, and Stretch 2.
In 2013, he lent additional production on four songs from the Kanye West sixth studio album Yeezus, in which he also served as one of the three production consultants along with Hudson Mohawke and Young Chop and as a producer on FKA Twigs' EP2. He self-released the &&&&& mixtape for free, and was involved in an audio-visual performance of &&&&& alongside Jesse Kanda, who contributed the visuals, at MoMA PS1 in October 2013.
Arca is a genus of saltwater clams in the family Arcidae, the ark clams.
Species within the genus Arca include: