However, according to some authorities it has since taken on the force of law because it is an act of Kiddush Hashem (lit.
"sanctification of the Name", referring to actions which bring honor to God).
In the early 19th century in the United States, rabbis often wore a scholar's cap (large saucer-shaped caps of cloth, like a beret) or a Chinese skullcap.
Other Jews of this era wore black pillbox-shaped kippot.
The 17th-century authority Rabbi David Ha Levi Segal (The "Taz") suggested that the reason was to distinguish Jews from their non-Jewish counterparts, especially while at prayer.
He held that nowadays wearing a kippah is required by halacha.
One passage of the older literature is of significance: I Kings mentions חֲבָליִם havalim, which are placed around the head.In the United States, children's kippot with cartoon characters or themes such as Star Wars are popular.(In response to this trend, some Jewish schools have banned kippot with characters that do not conform to traditional Jewish values.In the Middle Ages in Europe, the distinctive Jewish headgear was the Jewish hat, a full hat with a brim and a central point or stalk.Originally used by choice among Jews to distinguish themselves, it was later made compulsory in some places by Christian governments as a discriminatory measure.