Skullcap or skull cap usually refers to various types of

headgear Headgear, headwear, or headdress is the name given to any element of clothing which is worn on one's head, including hats, helmets, turbans and many other types. Headgear is worn for many purposes, including protection against the elements, de ...

. Specifically it may refer to:

Headwear

Beanie (seamed cap) In the United States, a beanie is a head-hugging brimless cap, sometimes made from triangular panels of material joined by a button at the crown and seamed together around the sides. Beanies may be made of cloth, felt, wool, leather, or silk. In ...

Biretta The biretta ( la, biretum, birretum) is a square cap with three or four peaks or horns, sometimes surmounted by a tuft. Traditionally the three-peaked biretta is worn by Catholic clergy and some Anglican and Lutheran clergy. A four-peaked bire ...

, forming part of some clerical, academic or legal dress *

Calotte (Belgium) The calotte (plural calottes, French from Provençal ''calota'' or Italian ) is a skullcap worn by students at Catholic universities in Belgium. It originates from the skullcap worn by the Papal Zouave regiment around 1860. The calotte is cylindr ...

, a skullcap worn by students at Catholic universities in Belgium *

Capeline The lobster-tailed pot helmet, also known as the zischägge, horseman's pot and harquebusier's pot, was a type of post-Renaissance combat helmet. It became popular in Europe, especially for cavalry and officers, from c. 1600; it was derived from ...

, worn under civilian hats during early modern periods *

Cervelliere A cervelliere (cervelière, cervelliera; la, cervellerium, ''cerebrarium'', ''cerebrerium, cerebotarium'') is a hemispherical, close-fitting skull cap of steel or iron. It was worn as a helmet during the medieval period. History The cervel ...

, a medieval metal helmet *

Jeep cap The jeep cap, sometimes referred to as the jeep hat, originally the US Army issued Cap, Wool, Knit, M1941 is a knit cap with a short visor made mostly from knitted yarn, originally wool, but now typically acrylic. Also sometimes referred to as a ...

Kippah A , , or , plural ), also called ''yarmulke'' (, ; yi, יאַרמלקע, link=no, , german: Jarmulke, pl, Jarmułka or ''koppel'' ( yi, קאפל ) is a brimless cap, usually made of cloth, traditionally worn by Jewish males to fulfill the c ...

or yarmulke, worn by Jewish men *

Kufi A kufi or kufi cap is a brimless, short, and rounded cap worn by men in many populations in North Africa, East Africa, West Africa, and South Asia. It is also worn by men throughout the African diaspora. It is also commonly called a "topi" or ...

, worn primarily by men of West African heritage *

Scrum cap The scrum cap is a form of headgear used by rugby players to protect the ears in the scrum, which can otherwise suffer injuries leading to the condition commonly known as cauliflower ears. Although originally designed for forwards they are now wo ...

, worn by rugby players *

Sindhi cap The Sindhi cap, also known as the Sindhī ṭopī () rarely known as the Sindhi Kufi ( sd, سنڌي ڪفي), is a skullcap worn predominantly by Sindhis in Sindh, Pakistan. Together with Ajrak or Saraiki Ajrak, the Sindhi cap is regarded as an ...

worn by Sindhi people of Pakistan, and others * Scrubs (clothing)#Scrub caps, worn by healthcare professionals while performing procedures *

Taqiyah (cap) The Taqiyah ( ar, طاقية, ALA-LC: ''ṭāqīyah'' Turkish: "takke", Urdu, Hindi "topi", , ALA-LC: "ṭopī", bn, টুপি, ''ṭupi'', Somali: "Koofi")) or araqchin () is a short, rounded skullcap. It is often worn for religious purp ...

, worn by some Muslim men *

Tubeteika A tubeteika ( rus, тюбете́йка, links=1, tyubeteika, tʲʉbʲɪˈtʲeɪ̯kə, LL-Q8798 (ukr)-Tohaomg-тюбетейка.wav) is a Russian word for many varieties of traditional Central Asian caps. Tubeteikas are today worn in Tajikistan, ...

, a Central Asian cap *

Tuque A knit cap is a piece of knitted headwear designed to provide warmth in cold weather. It usually has a simple tapered shape, although more elaborate variants exist. Historically made of wool, it is now often made of synthetic fibers. Found a ...

, a knit hat *

Zucchetto The zucchetto (, also ,"zucchetto"
(US) and ,

, worn by Catholic clergy

Plants

* ''

Galerina marginata ''Galerina marginata'', known colloquially as funeral bell, deadly skullcap, autumn skullcap or deadly galerina, is a species of extremely poisonous mushroom-forming fungus in the family Hymenogastraceae of the order Agaricales. It contains th ...

'', a poisonous mushroom also known as "deadly skullcap" or "autumn skullcap" * ''

Scutellaria ''Scutellaria'' is a genus of flowering plants in the mint family, Lamiaceae. They are known commonly as skullcaps. The generic name is derived from the Latin ''scutella'', meaning "a small dish, tray or platter",Scutellaria baicalensis ''Scutellaria baicalensis'', with the common name Baikal skullcap or Chinese skullcap, is a species of flowering plant in the family Lamiaceae. Distribution The plant is native to China, Korea, Mongolia, and Russia in the Russian Far East and Si ...

'' ("Baikal skullcap", "Chinese skullcap"), an herb native to eastern Asia ** ''

Scutellaria lateriflora ''Scutellaria lateriflora'', (commonly "blue skullcap", "mad dog skullcap",