♨ is a symbol widely used in Japan to indicate hot springs and bathing facilities, and it is commonly called the “hot spring mark.” The design is generally thought to depict 3 steam lines rising above a bowl-like vessel (a yu-tsubo), and you can see it in many places, including maps, inn signs, information boards, and restaurant menus. It is also included in Unicode (U+2668, HOT SPRINGS) and is used as a hot spring map symbol on topographic maps published by the Geospatial Information Authority of Japan.

In short, the hot spring mark is a neutral symbol in Japan that indicates “there is a hot spring or bathing facility here.” It does not imply a special rank or therapeutic effect. However, its origin and the interpretation of its design are debated, and there are different views on when it first appeared and how it evolved. In this article, we explain what ♨ represents, the theories about its origin, its role as a map symbol, the 2016 design debate, and what visitors to Japan should keep in mind when spotting ♨, while avoiding definitive claims. For the definition of hot springs themselves, see What Is an Onsen?, and for the cultural background of why hot springs are deeply rooted in Japanese life, see Why Japanese People Love Hot Springs and Saunas. Here, we focus only on the symbol itself.

What does the hot spring mark ♨ represent?

The hot spring mark ♨ is said to stylize 3 steam lines rising above a vessel filled with hot water. The common interpretation is that the curved shape at the bottom represents a yu-tsubo or bowl, while the 3 wavy lines above it represent rising steam. It is a simple design that instantly conveys one of the most recognizable features of a hot spring: boiling water and steam.

This symbol is not only used in daily life but also has a formal position in standards and character encoding. Unicode includes it as U+2668, labeled HOT SPRINGS, so it can appear as ♨ on computers and smartphones. In cartography, it is used as the hot spring map symbol on topographic maps created by the Geospatial Information Authority of Japan. In other words, the hot spring mark is both a familiar visual cue and an officially recognized symbol embedded in public maps and information systems.

For travelers, the key point is that ♨ is a neutral sign indicating “a hot spring is here.” It does not show water quality or rank, and you cannot tell the spring’s type or scale just from the symbol. For more on how hot springs are defined, see What Is an Onsen?, so it helps to separate the symbol from the facility itself.

The origin of the hot spring mark: the Isobe Onsen origin theory and other views

There is no single confirmed answer to the origin of the hot spring mark, and several theories exist. The best-known one links it to Isobe Onsen in Annaka, Gunma Prefecture. According to local explanations, an illustration prepared by the shogunate in the Edo period, said to date from 1661 and related to a dispute over land boundaries, included a symbol marking the location of a hot spring. This is considered the prototype of today’s hot spring mark, and Isobe Onsen has long referred to itself as the “birthplace of the hot spring symbol.”

That said, this is only one widely known theory, and it cannot be stated with certainty. Questions remain about whether the symbol’s shape was exactly the same as today’s ♨ at the time, when it spread nationwide, and whether there were earlier examples elsewhere. Because explanations differ depending on region and source, the most careful understanding is that “Isobe Onsen is said to be the birthplace” and that “a hot spring symbol is said to have appeared in an Edo-period illustration.”

Even if the details of its origin remain disputed, it is certain that ♨ gradually became rooted in Japanese society and evolved into a standard symbol for maps and signage. The origin story reflects the fact that hot springs have long attracted public interest and have been seen as important places worth recording on maps.

The hot spring mark as a map symbol

One of the most common official uses of the hot spring mark is on maps. On topographic maps created by the Geospatial Information Authority of Japan, the hot spring mark is used as a symbol for hot springs and their sources. If you find ♨ on a topographic map, you can read it as indicating that there is a hot spring at that location. Map symbols are designed to convey land information with limited graphics, and the hot spring mark is part of that system.

As a map symbol, the hot spring mark is also widely used in tourist maps, road maps, and facility guide maps. When travelers check the area around their destination using a paper map or a map app, the presence of ♨ can help them find hot spring facilities. However, a map symbol only shows that there is a facility or source classified as a hot spring there; it does not tell you whether it is open, whether bathing is allowed, or how much it costs. Before visiting, you should confirm the latest information for each facility separately.

Design debate: the 2016 proposal and coexistence with the traditional symbol

The hot spring mark has long been loved, but its design has also been debated. The most talked-about development came around 2016. One background issue was the idea that, with more visitors to Japan, the traditional ♨ with 3 rising steam lines might not intuitively communicate “hot spring” because it could look like “hot food” or “a very hot place.”

In response, a new design was proposed that added a person soaking in the bath alongside the steam and vessel. It was considered in the context of revising JIS guide symbols, with the goal of making it clearer that the sign refers to a bathing facility rather than food. This discussion was covered widely in the media at the time and drew both support and criticism.

The important point, however, is that the traditional ♨ was not abolished. While the new design was proposed and considered, the classic 3-steam hot spring mark continues to be widely used. Users and businesses can choose which symbol to use depending on the situation, so both may still appear today. Because design standards and their treatment can change, we will limit ourselves here to the factual point that the new proposal emerged and now coexists with the traditional mark, without making a definitive judgment.

Tips for visitors to Japan when identifying the hot spring mark

For travelers, the hot spring mark is a useful way to find hot springs and bathing facilities. You can look for ♨ on maps, confirm it on inn or facility signs, and even see it on restaurant menus when it refers to hot spring-related dishes or bathing services. In Japan, ♨ is generally understood as a neutral symbol indicating a place related to hot springs or bathing.

One thing to keep in mind is that people in other countries may associate ♨ with something else. In some regions, a steam-like symbol may be mistaken for a type of facility other than a hot spring. In Japan, however, ♨ is simply a common symbol for hot springs and public baths, and it is not used with any special hidden meaning. When you see ♨ on a map or in official guidance, you can interpret it as indicating the presence of a hot spring.

Another important point is that, as a symbol, ♨ does not tell you everything about the facility. You cannot tell from the symbol alone whether it is a hot spring, an inn with hot spring baths, or a place that offers day-use bathing. Before you go, it is wise to check opening hours, bathing rules, and prices for each facility. If you understand how hot springs are positioned in Japanese culture, it becomes easier to appreciate the background of the symbol as well. For more, see Why Japanese People Love Hot Springs and Saunas.

Frequently asked questions

What does the hot spring mark ♨ mean?

It is said to be a stylized image of 3 steam lines rising above a vessel filled with hot water, and in Japan it is used as a neutral symbol indicating the location of a hot spring or bathing facility. It is also included in Unicode as U+2668 (HOT SPRINGS) and is used as a hot spring map symbol on topographic maps by the Geospatial Information Authority of Japan. It does not represent water quality, benefits, or rank.

How old is the hot spring mark?

Its exact origin is unclear, but one well-known theory links it to Isobe Onsen in Annaka, Gunma Prefecture. The explanation says that an Edo-period illustration prepared by the shogunate in connection with a land dispute, said to date from 1661, included a symbol marking the location of a hot spring, which became the prototype. This is only one theory, and because there are different views on its shape and spread, it cannot be stated with certainty.

Do the 3 steam lines on the hot spring mark have a special meaning?

They are generally understood to represent the bowl or vessel below as a yu-tsubo and the 3 lines above as rising steam. It is easiest to think of the symbol as a concise visual expression of a hot spring’s defining feature: boiling water and steam. There is no official rule stating that the number 3 has a special separate meaning.

I heard the design of the hot spring mark changed. Is that true?

Around 2016, a new design proposal was introduced after concerns that the steam lines could look like food. The new proposal added a person soaking in the bath and was discussed in the context of revising JIS guide symbols. However, the traditional ♨ was not abolished, and both versions continue to coexist today.

Can the hot spring mark mean something different overseas?

In some countries or regions, people may associate a steam-like symbol with something other than a hot spring. In Japan, however, ♨ is a standard symbol for hot springs and public baths. When you see it on a map or in official guidance, it is safe to understand it as indicating a hot spring.

Summary

The hot spring mark ♨ is said to be a stylized image of 3 steam lines rising above a yu-tsubo, and in Japan it is widely used as a neutral symbol indicating the location of a hot spring or bathing facility. It is included in Unicode (U+2668) and is also used as the hot spring map symbol on topographic maps created by the Geospatial Information Authority of Japan. As for its origin, a theory known from Gunma Prefecture links it to Isobe Onsen and says the symbol appeared in an Edo-period illustration, but there are different views on its shape and spread, so it cannot be stated with certainty.

In terms of design, a new proposal that added a person was considered around 2016, and it now coexists with the traditional ♨. For travelers, the key is to use ♨ as a sign for finding hot spring facilities while remembering that the symbol alone does not reveal a facility’s details or operating status. Learning the background of the symbol also helps deepen your understanding of Japanese hot spring culture itself. To understand the definition of hot springs, read What Is an Onsen?, and to learn the cultural background, read Why Japanese People Love Hot Springs and Saunas.

Sources

• Geospatial Information Authority of Japan (map symbols)
• Ministry of Economy, Trade and Industry (Japanese Industrial Standards, JIS)
• Annaka City (Isobe Onsen, birthplace of the hot spring symbol)