A standard healing item that cures Silence. The alternate (hi-tech) version of Echo Grass.
山彦煙幕 / やまびこえんまく[yamabiko enmaku] or 'echo smokescreen' in Japanese.
Final Fantasy VII

Use: cures Silence
Buy: 100 gil (sell: ? gil)
Shop: Gold Saucer, Gongaga, Junon, Wall Market
Drop: Elligor, Thunderbird
Final Fantasy IX

Buy: 50 gil (sell: 25 gil)
Shop: Lindblum (Alice's shop, Dragon's Gate merchant, Dragoos' shop (disc 3)), South Gate (Bohden Arch shop, Summit shop), Burmecia (Atlas's mogshop), Treno (slum item shop), Cleyra (Star Maiden Nina's shop), Fossil Roo (Mogki's mogshop, Treasure Hunter's shop, Kuppo's mogshop), Conde Petie (Wendy Grocer's shop), Black Mage Village (item shop), Madain Sari (Morrison's shop), Alexandria (item shop (disc 3)), Esto Gaza (equipment shop (before Desert Palace)), Hilda Garde 1, Oeilvert (Mimoza's mogshop), Desert Palace (Mojito's mogshop), Mt Gulug (Mogtaka's mogshop), Daguerreo (item shop), Ipsen's Castle (Kumool's mogshop), Bran Bal (Moorock's mogshop)
Treasure: (various treasures)
Obtain: dig up during Chocobo Hot & Cold, dig up 5 on the world map with the Chocograph 'Cold Field'
Use: Ether
Description: Cures Silence
Other: note that despite being called 'Echo Screen' in English, the Japanese name is 山彦草 which is otherwise translated as 'Echo Grass'
Final Fantasy X
Buy: ? gil (sell: ? gil)
Obtain: (multiple ways)
Equip effect: x60 for Silencetouch, x30 for Silenceward, Aeon effect: -
Description: Removes Silence from one target
Category: Item