Samekh

Samekh is the 15th letter of the Alephbet and is pronounced as an 's' as it would be in 'savoury' or 'sour':

Be careful when reading not to confuse Samekh with Mem, and especially not with Mem sofit. You will note that in the image, Samekh is rounded whereas Mem is more of a square box, but not all written materials will make the difference as obvious as this.

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