The most simple sign is the "Star of David".
The Star of David consists of two equilateral triangles superimposed over each other, such that one triangle points with its peak pointg up up, and the other with its peak facing down. The triangles are centered upon each other such that he interior of the composed shape forms a hexagon.
The Menorah.
It represented the Star of David which is the sign for Judaism
In Judaism, it's a sign of mourning. See for example Genesis ch.37.
It's a sign of modesty to avoid unwanted sexual attention.
There is no special meaning in Judaism to spitting in somebody's face. It is simply a universal sign of being rude and of disdain.
There are no rooms in Judaism. Judaism is a religion, not a building.
Opposite of the lack of Judaism? Judaism.
Judaism is called Judaism.
Judaism's real name, in English, is "Judaism".
Christianity and Judaism
Lots of those. In more or less the order of most traditional to least traditional, here are some: Modern Orthodox Judaism Masorti (Traditional) Judaism Conservative Judaism Reform Judaism Liberal Judaism Reconstructionist Judaism Renewal Judaism Humanistic Judaism
Judaism itself is one religion; the religion of Judaism. See also:Divisions within Judaism
Abraham is known as the father of Judaism, but there is no person known as "the leader of Judaism".