While identical in shape to a small ケ, the shape is actually an abbreviation for the kanji 箇, specifically by writing half of the bamboo radical 竹 (⺮), and ヶ is used as an abbreviation 箇 (alternatively written 個 or 个), which is a common Japanese counter word. It is also as an abbreviation for the Japanese conjunctive particle が. It is unrelated to the katakana character ケ, which is an abbreviation for 介, but ヶ is sometimes written as a large character ケ. Although it resembles the katakana character ke (ケ), it is pronounced ka (sometimes ko) when a counter, or ga when a conjunction, not ke. When used as a counter pronounced ka, the katakana カ or ヵ are sometimes used instead; when used as a counter pronounced ko, the katakana コ is sometimes used instead (chiefly in informal writing) – ヶ follows the shape, while ヵ (or コ) follows the sound. However, ヶ is not used as a general abbreviation for 箇 or 個 – for example, 個人 kojin, "individual" will not be written as ×ヶ人 (except possibly as very informal ryakuji; contrast with 〆, as abbreviation for 締); note that 個 is used in various words, but 箇 is generally only used as a counter, or variant of 個.
The most familiar example as a counter is for counting months, as in 1ヶ月 (ik-ka-getsu, one month [duration]) where it is pronounced ka. Other common examples are places 〜ヶ所 -ka-sho and countries 〜ヶ国 -ka-koku.
An example where it is pronounced as ko is when counting small objects, such as pieces of fruit or candy, where one may write 一ヶ (ik-ko), rather than the more formal 一個; this is particularly common in hand-written signs at shops, though 一コ is also common.
When used as a conjunction, 〜が〜 -ga-, it has the same meaning as 〜の〜 -no- (which is more common in modern Japanese), and is commonly used in place names, though rare in everyday words. One relatively common word using ヶ is 雁ヶ音 karigane (kari-ga-ne – goose-'s-sound, the cry of the wild goose).
In place names, it is generally a conjunction, and hence pronounced ga, particularly as 「～ヶ原」 (-ga-hara) "field of ...", as in 青木ヶ原 (Aokigahara, laurel-'s-field, field of laurel). It may also be a counter, where it will generally be pronounced ka, as in 三ヶ日 (Mikkabi, place name, "three days").
In some cases both ヶ and が (and even ケ) are used to write a place name, depending on the specific place with a given name or usage. This may have also changed over time, so older documents may use a different form, and old establishments may use an outdated spelling. The most conspicuous example is Jiyūgaoka, which refers to a number of places throughout Japan (see 自由ヶ丘), some of which officially use 自由が丘, 自由ヶ丘, or 自由ケ丘. The best-known of these is a popular neighborhood in Tokyo, whose official form is 自由が丘, but it was formerly 自由ヶ丘, changing in 1965 (the station changed in 1966), and some businesses use the older form.
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