無銘刀 [mumeito] in Japanese. It means 'unsigned blade'. This refers to the custom of inscribing each katana with its maker's name, and says that the signature is missing. In effect, a no-brand katana.
Airborne Brigade

N+
Type: Katana, Element: -, Growth: Fast, Cost: 5
Attack: 350 (lv1), ? (lv40), ? (lv50), ? (lv60), ? (lv70), 2,250 (lv80)
Defense: 350 (lv1), ? (lv40), ? (lv50), ? (lv60), ? (lv70), 2,330 (lv80)
Obtain: any chest that gives this rank
N
Type: Katana, Element: -, Growth: Fast, Cost: 1
Attack: 110 (lv1), 249 (lv20), ? (lv25), ? (lv30), ? (lv35), 310 (lv40)
Defense: 90 (lv1), 201 (lv20), ? (lv25), ? (lv30), ? (lv35), 250 (lv40)
Obtain: any chest that gives this rank
Pictlogica

Stats (lv1): STR +30
Stats (lv10): STR +50
Buy: - (sell: ? gil)
Obtain: Moore Desert, initial equipment on Edge
Use: Gunromaru
Type: Katana, Rarity: ★★, Element: -
Category: Equipment