re (movable-do solfège); ray
In movable-do solfège, レ is the second note of a major scale. Also used as a loanword for 'ray' in musical contexts.
from Italian
In do-re-mi-fa-sol-la-ti-do, re is the second note of the major scale.
In the fixed-do system, レ always represents the note D, regardless of key.
In fixed-do, re refers to the note D.