Hiyatan (ヒヤタン - Hiyatan: Drinking glasses for cold water, restaurant industry slang, and professional etiquette)

"Hiyatan" (ヒヤタン) is a Japanese food service industry slang term that is a shorthand contraction of "Hiyai Tumbler" (冷たいタンブラー - cold tumbler), referring specifically to "a drinking glass used for serving cold water (O-hiya)".
It is mainly utilized among staff members in dining establishments, bars, and traditional Japanese pubs (Izakaya).

Etymology: Why is it called "Hiyatan"?

There are several theories regarding the exact origin of "Hiyatan":

• Serving Cold Water in Tumblers: In many Japanese eateries, cold drinking water (O-hiya) is standardly served to customers in tall tumbler glasses.
• General Shorthand for Cold Drink Glasses: Restaurant staff traditionally referred to all simple glasses meant for serving cold beverages as "tumblers," leading to the contraction.

Sometimes, it is also written or referred to as "Reitan" (冷タン), which uses a different phonetic reading of the kanji for cold.

Types of Glasses Reflected by "Hiyatan"

The exact type of glass designated as a "Hiyatan" varies depending on the restaurant's operational style, but generally includes the following:

• Tumbler Glass (タンブラーグラス)
  Standard cylindrical, tall-sided glass.
• Koppu (コップ)
  A generic, shorter cylindrical glass than a tumbler, often made of thick glass or plastic.
• Jokki (ジョッキ / Mug)
  A large beer mug with a handle. (Only a small minority of restaurants serve complimentary water in beer mugs.)

Examples of "Hiyatan" in Daily Restaurant Dialogues

• "Please serve the cold water (O-hiya) in a Hiyatan."
  Instructing staff to provide the table water in a standard cold tumbler glass.

• "Bring three Hiyatans to that table."
  Directing a server to carry three glasses of cold water to a specific customer table.

• "Excuse me, this Hiyatan seems a bit dirty."
  A customer pointing out an issue or smudge on the served water glass.

• "Sorry, could I get a refill for my Hiyatan?"
  A customer requesting a refill of their cold drinking water.

• "I'll clear this used Hiyatan and bring you a fresh one."
  A server offering to remove the old water glass and replace it with a clean setup.

• "This Hiyatan is very thin and offers a great mouthfeel."
  Praising the premium quality and craftsmanship of the restaurant's glassware.

Crucial Etiquette: When to Avoid Using "Hiyatan"

It is vital to note that "Hiyatan" is strictly professional restaurant industry jargon (slang), and is generally not understood by the average dining customer. When interacting with guests, staff should always employ polite, standard terms like "O-hiya" (お冷 - cold water), "O-mizu" (お水 - water), or "Glass" (グラス) to maintain a professional service tone.
Additionally, some food service operations or high-end establishments do not use the term "Hiyatan" even among internal staff.

Slang and Terms Related to "Hiyatan"

• Tumbler (タンブラー): Standard tall cylindrical glassware for cold drinks.
• O-hiya (お冷): Polite Japanese restaurant term for cold drinking water.
• Chaser (チェイサー): A serving of water or mild beverage taken immediately after consuming a strong alcoholic drink to refresh the palate.