Hello Humanist. Explain Selam? You say "Yiassou" and I say "selam". Is that Ok with you. Or are you looking for more ammunition? The word SELAM is my abbreviated expression of the full phrase "Selam Aleykum" and the reply is usually "Aleykum Selam". It means "Peace be upon you" and the reply "upon you be peace". Since the phrase itself is Arabic I and many others (Turkish speaking) nowadays use the word Selam. The older generation still use the full version. Selam to you also.
I find it significant that it does not appear in Halils glossary he kindly produced.