Flagrate

Flagrate conjures a burning, fiery rope in the air, which can be directed in any shape or direction the caster chooses. A mark will linger as well and fade with time.

Known uses

 * In 1993, Tom Riddle's memory used the spell non-verbally when spelling his name to Harry Potter in the Chamber of Secrets. He can also rearrange the letters by waving his wand.
 * Hermione Granger used this spell to mark doors with an "X" in the Department of Mysteries in 1996.

Etymology
The word Flagrate comes from the Latin words "flagro" meaning "glowing/blaze"

Appearances

 * Harry Potter and the Chamber of Secrets
 * Harry Potter and the Chamber of Secrets (film)
 * Harry Potter and the Order of the Phoenix

Behind the Scenes

 * Every time the spell is used in the series, it is used non-verbally.