Encounter Repellant

A spell, item or other thing that reduces or eliminates Random Encounters, or even Fixed Encounters, in a Role-Playing Game. This is often used for when a player has done enough Level Grinding and wants to get to the Boss Battle, or if the party is in danger (like low health and used up practically all healing spells/supplies) and needs to head to the nearest Trauma Inn ASAP, or just get to the nearest Save Point ASAP.

Heck, it can even work with some Preexisting Encounters, by causing the monsters to shy away from you.

Contrast Encounter Bait (and some games will have both).

Examples of Encounter Repellant include:

The "Safe Travel" augment in Final Fantasy IV DS.
"Read Ahead" ability from the Oracle job in Final Fantasy V (GBA) cuts random encounters by half. There's also a glitch which can eliminate encounters.
In Final Fantasy VI, the Charm Bangle cuts down encounters and the Moogle Charm eliminates them.
One of the materias in Final Fantasy VII reduces encounters at a greater rate depending on its level.
Diablos' "Encounter Half" and "Encounter None" abilities in Final Fantasy VIII.
Final Fantasy X has "No Encounters" ability that can be customized onto an armor and also a weapon obtained from Geosgaeno which eliminates random encounters.
Final Fantasy X-2 also features the Charm Bangle, which eliminates random encounters.
The Holy Bottles in the Tales (series), which either prevent random encounters, or make monsters run away from you, depending on the game. Certain food items in Tales of Destiny also gift the player with reduced encounters as a side effect.
In the remakes of the first two Star Ocean" games for the PSP, opening the UMD tray would make it impossible for random battles to trigger, though you have to close it and re-open it every time you go from one screen to another.
Pokémon has "Repel" items, which prevent wild Pokémon encounters as long as the lead party member is a higher level than what you're encountering. It will not, however, avoid battles against other Pokémon Trainers. Generation II had the Pokémon Lullaby music on the Johto Radio Station; Generation III added the Black Flute for reducing the encounter rate, and a few Pokémon abilities (like "Intimidate") can also reduce the encounter rate.
Golden Sun has the Sacred Feather item and the Avoid spell.
First two Fallout games as well as Fallout Tactics has skill called Outdoorsman. If it is high enough and you are traveling through the desert and encounter someone, you will be offered to choose do you want to meet them or keep moving.
In Skies of Arcadia, you equip the White map.
Sweet Water in Lufia
Protect Ball in Paladin's Quest
The Fright Mask (Paper Mario and The Thousand-Year Door) could scare away some weaker enemies during battle. The "First Attack" and "Bump Attack" badges could clear weaker enemies in the field.
Holy Water and the Repel/Holy Protection spell from the Dragon Quest series.
The Etrian Odyssey games have the Ward Chime, which reduces the rate of monster encounters for a limited number of turns/steps, and certain classes have a skill with the same effect (or the inverse). Farmers from the third game can also learn Safe Stroll, which prevents non-fixed encounters altogether for a period of time.
The Sybll's Balm item in Glory of Heracles reduces the rate of monster attacks for a limited time.
ZanZarah featured the consumable Garlic Atomizer, which could be used to scare away any randomly attacking wild faery.
"Enemy Begone" and the higher-level "Enemy Lullaby" in Shin Megami Tensei: Strange Journey.
- On a New Game+, you can buy Red Carpet, which removes encounters completely.
Tradewinds Legends has an item that causes you to encounter fewer pirates (but more storms).
Repulse Water in the Raidou Kuzunoha games. Some demons come equipped with the "Intimidate" skill, which works exactly like the Water and can be used infinitely.
Breath of Fire games have a share of enemy repellants.
Mega Man Battle Network has SneakRun (ShinobiDash in the Japanese versions). But it mostly repels the weaker enemies. In 3, it's also needed to fight some bosses. How anyone was supposed to know this is a mystery
Legend of Legaia has the Good Luck Bell, and much later, the Evil Talisman as accessories that reduce the encounter rate, and Incense as a consumable item that does the same.