Title: Pint glass
Content:   It is increasingly common to find pint glasses which contain markings on the base; very often these glasses are branded to one particular beer. The markings themselves are formed from small pits, which aid in nucleation, allowing the gas within it to be released more easily, thus preserving the head. Without the aid of these pits a regular pint glass will keep a head for only 3 or 4 minutes before appearing "flat". The markings come in a variety of styles ranging from a simple circular or square hatched pattern to more complicated branding messages.
Title: Pint glass
Content:  imperial pint. However, this law is rarely enforced in some provinces, such as British Columbia, and establishments sometimes sell US pints or other measures as "pints." The Republic of Ireland uses the imperial 20 fl oz pint measure (≈568 ml), where legal metrology marks are used to show that a glass has passed inspection by the National Standards Authority of Ireland, a state-run body which enforces a number of standard rulings. Starting in 2006, the NSAI "pint" mark, a circle featuring two wavy lines, between which "PINT" is written, with a year mark (last two digits), and a three digit batch code either side; has begun to be phased out with 
Title: Pint glass
Content:   Pint glass collecting is an increasingly popular way for individuals to commemorate their visits to popular tourist destinations, most notably to microbreweries or sports arenas. These destinations often sell pint glasses adorned with their logos, which are either screen-printed or engraved on the side of the glass. Brewery enthusiasts may travel thousands of miles to see where their favorite beer is made or to sample new local and fresh beers, and collectors often display their collections (which sometimes total in the hundreds) in display cases or on shelves. Beer festivals frequently have commemorative pint glasses made specially for the event.
Title: Pint glass
Content:   In the United Kingdom, draught beer must be sold in Imperial measure (see ). United Kingdom law requires certain steps be taken to ensure that a pint of beer is indeed a pint. Though this can be achieved using "metered dispense" (calibrated pumps), the more common solution is to use certified one-pint glasses. Until recently these had a crown stamp indicating that the certification had been done by an agency of the Crown. The number etched upon the glasses stands for the manufacturing company or site. Most pint glasses used in the United Kingdom today have actually been produced in France. Under the EU Measuring Instruments 
Title: Pint glass
Content:  European standard "PINT"/CE logo stamp. Smaller Pint glasses have been used in pubs and nightclubs though. In Israel, although officially defined as 568ml, pubs use the term rather arbitrarily and the "pints" served constitute a wide range of volumes (360ml–440ml). In the past, the custom was to serve beer in 330ml or 500ml in the original beer manufacture's glass. After the reform in the alcohol taxes in July 2012 the tax rate doubled. Each liter of beer is charged with 4.2nis tax. In order to avoid raising prices at the pubs, and as a result, the loss of customers, a new "magic" appeared, called "pint". The customers don't really know the 
Title: Pint glass
Content:  term of a pint, and it varies from place to place. Some of the places didn't even change the menu, and it's served as 500 ml. In the United States, a pint is 16 USoz. However, the typical conical "pint" glass holds 16 ounces only when filled to its rim with liquid. With a half-inch of foam, the actual liquid fill is roughly 14 ounces, missing one eighth of its volume. In recent years, some restaurants replaced 16 USoz pint glasses with 14 USoz glasses, to which customers objected. In response to this, legislation in the state of Michigan (known for its craft brewing culture) requires bars to serve 16-ounce pints.
Title: Pint glass
Content:  that "a Crown stamp look-alike could naturally be affixed to the glass, as long as it is done in such a way that it is not confused with the CE marking". Following the withdrawal of the United Kingdom from the EU ("Brexit") the CE mark is being replaced by the UKCA marking for goods placed on the market in Great Britain, and in September 2021, it was announced that the Crown would return to pint glasses in the UK. Selling beer in unmeasured glasses without using some other form of calibrated measure is illegal. Half-pint, one-third pint and two-thirds pint (schooners) glasses are also available and 
Title: Pint glass
Content:  than the other types and are regarded as more traditional. This sort of glass is also known as a "Handle" or "Jug" due to the handle on the glass. ; Tulip glasses are more modern, having a taller shape, and usually flaring out towards the top; these designs are more commonly associated with continental lagers or promotional campaigns by breweries, and are frequently etched or marked with the beer's label. ; Can-shaped glasses are shaped like a standard beer or beverage can, with straight cylindrical sides and an inverted lip. They are less prone to tipping over than a conical glass, and without the need for a heavy base for stability, they are around 40% lighter. The common shapes of pint glass are: 
Title: Pint glass
Content:   A pint glass is a form of drinkware made to hold either a British imperial pint of 20 impoz or an American pint of 16 USoz. Other definitions also exist, see below. These glasses are typically used to serve beer, and also often for cider.
Title: Pontil mark
Content:  A pontil mark or punt mark is the scar where the pontil, punty or punt was broken from a work of blown glass. The presence of such a scar indicates that a glass bottle or bowl was blown freehand, while the absence of a punt mark suggests either that the mark has been obliterated or that the work was mold-blown. Some glassblowers grind a hollow into the base of their work, obliterating the natural punt scar. Where the base of the work is sufficiently heavy, the entire natural base can be sawed or ground flat. Where the base of the work is concave, after the punt has been broken from the work, the punt may be used to attach a small gather of hot glass over the punt scar, into which a maker's mark is impressed. 

Question: what does the m number mean on a pint glass?
Answer: imperial fluid ounces.
the manufacturing company or site.