Circumflex facts for kids
In French, the circumflex usually shows the loss of letter, usually the loss of the letter s. Example: maistre (Middle French) > maître (modern French). Here its function is historical.
Also, less often, the circumflex is used to distinguish between homophones. These are words spelt the same, but with different meanings. Example: sur = on, but sûr = safe or certain. In those cases the pronunciation of the two words may be different.
Circumflex Facts for Kids. Kiddle Encyclopedia.