Tav

The last letter of the alephbet is Tav:

You will sometimes see this character with a dagesh mark which in modern Hebrew does not change pronunciation. However, in ancient Hebrew, Tav without the dagesh would have been pronounced 'th' (as it would in the word Sabbath for example).

Furthermore, in Ashkenazi Hebrew, a Tav without the dagesh would be pronounced as an 's', but in modern usage, Tav is a 't', used as it would be in 'terrify' or 'tango'.

Introduction to Reading Hebrew
The first basics
The Hebrew AlephBet
The Letters of the AlephBet
Aleph
Bet (Beyt)
Gimmel
Dalet
Hey
Vav
Zayin
Chet
Tet
Yod
Kaf
Lamed
Mem
Nun
Samekh
Ayin
Pey (Fey)
Tsade (Tsadik)
Qof
Resh
Shin
Tav
The Significance of the Alephbet
The Basics of Hebrew Verbs
The Hebrew Verb Subject
The Hebrew Verb Object
Hebrew Verb Tenses
Hebrew Verb Voices and Moods
Hebrew Verb Participles
The Infinite Verb Version
Hebrew Nouns
Hebrew Noun Constructs
Using Prefixes With Nouns
Hebrew Pronouns
Hebrew Plural Nouns
Hebrew Adjectives
Identifying Hebrew Questions
Adverbs, Prepositions and Conjunctions
Hebrew Reading Conclusion