ש Shin/Sin - 21st letter - Gematria 300
ש is peculiar in that it has 2 equal pronunciations, as SH or as S in English. When it is pronounced as S it has exactly the same phonetic value as ס (Samekh).
The reason for these 2 different pronunciations is not known to the modern simple man. Maybe TLS with its claim of 5,000 years of unbroken history knows? If so, could they share that secret with us as well, please?
In Aramaic ש is pronounced as SH.
Peace (or Hello, Goodbye) in Hebrew is שלום (Shalom). In Aramaic is שלמא (Shlama).
A common word that starts with ש pronounced as S is שׂמח (same'ach), meaning Joyful, Happy.
ישראל (Israel) is also written with a ש (Sin) not a ס (Samekh) in Hebrew.
When dots are added to the consonant word skeleton, to indicate vowels, begadKephat value, doubling of consonants or to distinguish between Shin and Sin, a dot is added to the right to indicate a Shin sound, like in שָׁלוֹם (Shalom). And a dot is added to the left to indicate Sin, like in יִשְׂרָאֵל (Israel)