雷のロッド / いかづちのロッド [ikazuchi no rod] or 'lightning rod' in Japanese. Usually translated as 'Thunder Rod' in English, but that is in fact another equip entirely.
Airborne Brigade

R+
Type: Rod, Element: Thunder, Growth: Normal, Cost: 14
Attack: 1,120 (lv1), 4,498 (lv80), 5,353 (lv100), 6,209 (lv120), 7,064 (lv140), 7,920 (lv160)
Defense: 1,060 (lv1), 4,259 (lv80), 5,069 (lv100), 5,879 (lv120), 6,689 (lv140), 7,500 (lv160)
Obtain: any chest that gives this rank
R
Type: Rod, Element: Thunder, Growth: Normal, Cost: 10
Attack: 730 (lv1), ? (lv60), ? (lv75), ? (lv90), ? (lv105), ? (lv120)
Defense: 750 (lv1), ? (lv60), ? (lv75), ? (lv90), ? (lv105), ? (lv120)
Obtain: any chest that gives this rank
Brave Exvius

Stats: ATK +14, MAG +26
Buy: - (sell: ? gil)
Treasure: Ample
Type: Rod, Number: 171
Description: A rod that lets you use Thundara
Profile: A rod that's capable of using the Lightning element magick Thundara. Lightning magicks are not only used in attacking, but have also long been used to move things. However, every usefulness hasn't yet been achieved. The problem is how there's no way to store the emitted energy. Presently it's required for a mage to keep spellcasting to function as a power source, so it's not very practical.
Other: enables use of Thundara
Pictlogica

Stats (lv1): STR +12, INT +14
Stats (lv10): STR +22, INT +24
Buy: - (sell: ? gil)
Obtain: Saronia Waterways
Alchemy: Rod, Purple Drop x2
Type: Rod, Rarity: ★★, Element: Lightning
Record Keeper

Lightning Rod (V)
Stats: ATK +6, MAG +19, MND +10, ACC 89 (lv1), ? (lv5), ? (lv10), ? (lv15), ATK +15, MAG +48, MND +24, ACC 89 (lv20)
Max Level: 10 (initial), 15 (first evolve), 20 (second evolve)
Type: Rod, Rarity: ★★★
Other: strengthens Lightning-element attacks (effect: small)
Other: this equip was translated as Thunder Rod officially in FF5
Category: Equipment