炎 / ほのお [honoo] or 'flame' in Japanese. There is also a materia of the same name.
Final Fantasy III
Power: 100, Weight: 4, Element: Fire, Target: all enemies
Use: Dragon
Description: deals fire element damage to all targets
Type: Monster Ability
Final Fantasy IV
Type: Ninjutsu, MP: 20
Casting: 3 seconds
Learn: Edge lv 0
Other: 火遁 / かとん [katon] in Japanese, so is a different ability than the others listed here. See Katon
Pictlogica

Flame
Type: Black Magic, Rarity: ★★★, Charge: 30-41
Target: single, Strength: 5, Max Level: 12, Element: Fire
Buy: - (sell: ? gil)
Obtain: event quest One-winged Angel
Description: Black Magic that attacks an enemy with flames. Deals a small amount of Fire damage to a single enemy
Other: note that this ability is a reference to the materia of the same name

Flame★
Type: Black Magic, Rarity: ★★★★, Charge: 44-61
Target: single, Strength: 40, Max Level: 18, Element: Fire
Buy: - (sell: ? gil)
Obtain: event quest One-winged Angel
Description: Black Magic that attacks an enemy with flames. Deals a moderate amount of Fire damage to a single enemy.
Category: Ability