What is the meaning of Dalet?

The fourth letter of many Semitic alphabets (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others).

past participle of dale

dalet (fourth letter of the Hebrew and Phoenician scripts and the Northwest Semitic abjad)

dalet, specifically:

1. the name of the Phoenician-script letter 𐤃
2. the name of the Hebrew-script letter ד

the name of the Phoenician-script letter 𐤃

the name of the Hebrew-script letter ד

soft mutation of talet

Source: wiktionary.org