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Jigger
 Jigger is used to measure out (fluid) of liquor.

Shot Glass

  The word "shot", meaning a drink of alcohol, has been used since at least the 17th century, while reference to a shot specifically as a small drink of spirits is known in the U.S. since at least the 1920s. The phrase "shot glass" has been in use since at least 1940.

Sizes of Shot Glass

*Note fl oz is abbreviation from fluid ounce is a unit of volume (also called capacity) typically used for measuring liquids.

*N/A or n/a is a common abbreviation in table and lists for the phrase not applicable, not available, or no answer. It's used to indicate when information in a certain table cell is not provided, either because it doesn't apply to a particular case in question or because the answer in not available.

Country	Small	Single	Double	Notes
Australia		30 ml	60 ml	A single shot is sometimes called a “nip”. At 30 mL, a typical spirit with 40 percent alcohol is roughly equivalent to one Australian standard drink.
Bulgaria		50 ml	100 ml
Canada	30 ml	44 ml	71 ml	In Canada, a “shot” may refer to an official “standard drink” of 42.6 ml though many Establishments serve a “standard drink” of 1 oz. However, shot glasses available in Canada typically are manufactured according to US fluid ounces rather than imperial. Making them about 4% larger.
Denmark		20 ml	40 ml
Estonia	20 or 30 ml	40 ml
Finland	20 ml	40 ml	n/a	In Finland, the amount of strong alcohol that restaurant are allowed to serve is regulated by law
France		25 0r 35 ml	50 or 70 ml
Germany		20 ml	40 ml	In Germany, shot glasses are smaller
Greece		45 ml	90 ml	A shot is commonly referred to as a “Sfinaki” and it can be made of one liquor or a cocktail mix. There is also an 3 oz “bottom up” version of “Sfinaki” called “ipovrihio”, Greek word for submarine. It’s served in a standard liquor glass half full of blonde beer, where the bartender adds a glass shot filled with vodka or whiskey.
Hungary	20 or 30 ml	40 or 50 ml	80 or 100 ml	In Hungarian, shot glasses are called felespohár (feles means half, standing for 0.5 dl)
India	30 ml	30 ml	60 ml	A shot is commonly referred to as a”peg”, and is measured as a”small”(chhota), or a “large” (bud-da) peg. A 120 ml shot in India is called a Patiala peg.
Ireland		35.5 ml	71 ml	Derived from the use of a quarter-gill (35.516 ml, one sixteenth of a pint) as the traditional lrish spirit measure.
Isreal	30 ml	50 or 60 ml		In Israel, the common word for a small shot is צ'ייסר  (chaser)
Italy	30 ml	40 or 60 ml		In Italy, the common word for a shot is cicchetto or more informally and used mainly in nightclubs by young people,  shortino. In North Italy, the cicchetto is the most common way to taste grappa from at least two centuries.
Japan	30 ml	60 ml		In Japanese, the word ショットグラス (shottogurasu) is the singular term for a shot glass.
Poland		50 ml	100 ml	A standard shot (small) is called pięćdziesiątka (lit. fifty, as in 50 ml) while a large shot (double) is called setka or colloquially, seta (lit. a hundred, as in 100 ml)
Romania		50 ml	100 ml	A single shot is traditionally known in Romanian language as unu mic (una mică) meaning “a small one” or or cinzeacă, meaning “a fifty”, as in 50 ml. A double shot is simply called  unu (una mare), meaning “one(big)”
Russia		50 ml	100 ml	Both single and double shots are commonly called стопка (stópka) in Russian, though a variety of slang names exist. Before metrication a single shot was called  шкалик (shkálik) and amounted to 61.5 ml, while a double was called чарка (chárka) and was equal to 123 ml — both names are still occasionally used.
Serbia	20 ml	30 - 50 ml	60 - 100 ml	A single shot is traditionally known in the Sebian language as чашица за ракију and ракијска чашица, meaning “small glass for rakija"  and "rakija glass”, or simply as мера—мерица, meaning “measure”. A double shot is simply called Дупли, meaning “a double”, while the smallest, 20 ml glass, is known as dvojka meaning “two”
Sweden	20 ml	40 ml	120 ml	A single shot is referred to as a fyra, meaning “a four” and a double is referred to as a sexa, meaning “a six” as Swedes generally use centiliters rather than milliliters
Slovakia	20 or 25 ml	40 or 50 ml	80 or 100 ml	The most common single shot size in the pol deci (literally, “half a deciliter”, 50 ml )
Slovenia	30 ml	50 ml	100 ml	The 50 ml size is colloquially known as nula pet (“zero five”, meaning 0.5 of a deciliter), and the small one nula tri (“zero three”). Another common term for a single shot is ta kratek, meaning “the short one”
South Africa		25 ml	50 ml	The South African government has an official definition for the single shot size.
United Kingdom		25 or 35 ml	50 or 70 ml	Shots sold on premises must contain either 25 ml or 35 ml measures of whisky, gin, rum, or vodka as defined in the weights and measures act of 1985. This requirement does not extend to other spirits. A 2001 amendment allowed a double shot of 70 ml to be served. Generally, a single measure is equal to 35 ml in Northern Ireland and Scotland and 25 ml in England and Wales.
United States	30 ml (1 US fl oz)	44 ml (1.5 US fl oz)	59 to 89 ml (20 to 3 US fl oz)	There is no standard size for a single shot, except in Utah, where a shot is defined as 1.5 U.S fl oz  (44 ml). Elsewhere in the U.S., the standard size is generally considered to be 1.25 – 1.5 U.S fl oz (37 – 44 ml). A double shot in the U.S may be 2 fl oz or more.

Sources
@ https://www.wikipedia.org/