What does 3 mean in Jewish numerology?

The number 3 has many significances in Judaism, but it has no single meaning.

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It can refer to the patriarchs:

• Avraham - Abraham
• Yitzchak - Isaac
• Yaakov - Jacob

It can refer to the 3 functions of a synagogue:

• A house of prayer
• A house of study
• A house of assembly

It can refer to the three things the world stands on:

• Learning
• Work
• Deeds of Kindness

It can refer to the 3 types of Jews:

• Cohen
• Levy
• Israel

3 activities that can reverse the evil decree:

• Repentance
• Prayer
• Charity

It can refer to the 3 major sections of the Rosh Hashana Musaf:

• Malchiyot (verses of kingship)
• Zichronot (verses of recollection)
• Shofrot (verses of the shofar)

It can refer to the 3 descriptions of Joseph by Pharaoh's wine steward:

• boy
• Hebrew
• slave