Just that. All of them.

ndiyo   (swahili – nndeeoh)
oui       (french)
haa’n   (hindi)
ia e       (irish – iss aa, it is)
oo        (tagalog – awe awe)
hai       (japanese)
sim      (portuguese, cape verde creole – sing)
si         (spanish, italian)
ja         (german, dutch, afrikaans, norwegian, swedish)
baleh   (farsi)
ken      (yiddish)
shi       (mandarin – shr)
na’am  (arabic)
já          (icelandic – yow)
igen      (hungarian)
evet      (turkish – aewet)
nai        (greek – nae)
bai        (basque)
tak        (belarusian, polish, ukrainian)
ydw       (welsh – uhdo)
yeebo    (zulu)
za          (mongolian)
taip        (lithuanian)
ae          (maori)
kyllä      (finnish)
ano       (czech)
hanji     (punjabi)
a-yo     (armenian)
ee         (inuktitut)
da         (romanian)
ioe        (samoan – ee yo-oy)
yesarva (rom)
co         (vietnamese)
aap       (greenlandic)
iva        (maltese)
yes       (english)

Every culture has a concept, if not a word for it. There is delicious freedom in a mindful yes.