What is the meaning of ?

The hiragana syllable (sa). Its equivalent in katakana is (sa). It is the eleventh syllable in the gojūon order; its position is (sa-gyō a-dan, row sa, section a).

third person personal pronoun; they

-ness

sentence-ending particle indicating emphasis

sentence-ending particle indicating familiarity or assertion

filler particle similar to (ne)

to

Source: wiktionary.org