Teth, also written as Ṭēth or Tet, is the ninth letter of the Semitic abjads, including Phoenician ṭēt 𐤈, Hebrew, Aramaic ṭēṯ 𐡈, and Syriac ṭēṯ ܛ, and Arabic ṭāʾ ط.
According to another hypothesis (Brian Colless[citation needed]), the letter possibly continues a Middle Bronze Age glyph named ṭab 'good', Aramaic טַב 'tav', Hebrew טוב 'tov', Syriac ܛܒܐ 'tava', modern Arabic طَيّب 'ṭayyib', all of identical meaning.
As well, in gematria, the number 15 is written with Tet and Vav, (9+6) to avoid the normal construction Yud and Hei (10+5) which spells a name of God.
Similarly, 16 is written with Tet and Zayin (9+7) instead of Yud and Vav (10+6) to avoid spelling part of the Tetragrammaton.
Tet is also one of the seven letters which receive special crowns (called tagin) when written in a Sefer Torah.