SKULL CAPS

From Dictionary.com:

skull cap [skuhl-kap]
noun

1. a small, brimless close-fitting cap, often made of silk or velvet, worn on the crown of the head, as for religious functions.

2. the domelike roof of the skull.

3. Botany. any of various plants belonging to the genus Scutellaria, of the mint family, having a calyx resembling a helmet.

Origin: 1675–85

From Wikipedia.org:

A skullcap (or skull cap) can be:

• In anatomy, the top part of the skull

Headgear

• A Kippah or Yarmulke, a small cloth skullcap worn by observant Jewish men all the time, or by less observant Jewish men and some Jewish women during religious services.
• Kufi, a skullcap worn by men of African descent, also called a kofia.
• Taqiyah (cap), a skullcap worn by Muslim men.
• Tuque, a knit hat
• zucchetto, worn by Catholic clergy (including the Pope)
• beanie, a brimless cap popular amongst school age boys from the 1920s to the early 1940s.
• Sports headgear produced by Under Armour (part of their HeatGear line), that resembles a swimming cap.
• An iron helmet (known as a capeline) worn under civilian hats during the medieval and early modern periods

• Plants of the genus Scutellaria, such as S. lateriflora, that is used in herbal medicine

• The autumn skullcap, a poisonous mushroom

• Skullcap, the name of fictional ruins in the Dragonlance settings.