Re

Noun
re (plural rehe)
 * 1) The name of the Latin-script letter R.

Etymology 2
Through 17th Century Italian. The first syllable of Latin resonare ("to resound"), the first word of the second line of the medieval hymn Ut queant laxis, from which the solfège syllables were taken because of its successive lines started each on the next note of the scale.

Noun
re (plural rehe)
 * 1) a syllable used in solfège to represent the second note of a major scale.