 The modern word "sine" is derived from the Latin word "sinus", which means "bay", "bosom" or "fold"
is indirectly, via Indian, Persian and Arabic transmission, derived from the Greek term "khordḗ" "bow-string, chord".The Hindu term for sine in Sanskrit is "jyā" "bow-string", the Hindus originally introduced and usually employed three trigonometric functions "jyā, koti-jyā, and utkrama-jyā.