Gypsum mortar, also called plaster of Paris, was used in the construction of the Egyptian pyramids and many other ancient structures.
It is made from gypsum, which requires a lower firing temperature.
There is also some disagreement as to what to call abbreviations that some speakers pronounce as letters and others pronounce as a word.
Whereas an abbreviation may be any type of shortened form, such as words with the middle omitted (for example, Rd for road or Dr for Doctor), an acronym is a word formed from the first letter or first few letters of each word in a phrase (such as sonar, created from The rest of this article uses acronym for both types of abbreviation.There is no rule on what to call abbreviations whose pronunciation involves the combination of letter names and words or wordlike pronunciations of strings of letters, such as JPEG .Critics later allowed the usage in some contexts, but their reasons are dubious at best.In point of fact, over has been used as a synonym of more than since the 1300s.Like retronymy, it became much more common in the 20th century than it had formerly been. Some examples of acronyms in this class are: Acronyms are used most often to abbreviate names of organizations and long or frequently referenced terms.
Ancient examples of acronymy (regardless of whether there was metalanguage at the time to describe it) include the following: During the mid- to late-19th century, an acronym-disseminating trend spread through the American and European business communities: abbreviating corporation names in places where space was limited for writing—such as on the sides of railroad cars (e.g., Richmond, Fredericksburg and Potomac Railroad → RF&P); on the sides of barrels and crates; and on ticker tape and in the small-print newspaper stock listings that got their data from it (e.g., American Telephone and Telegraph Company → AT&T). The armed forces and government agencies frequently employ acronyms; some well-known examples from the United States are among the "alphabet agencies" (also jokingly referred to as "alphabet soup") created by Franklin D.Mortars are typically made from a mixture of sand, a binder, and water.The most common binder since the early 20th century is Portland cement but the ancient binder lime mortar is still used in some new construction.Usage Note: While working as a newspaper editor in the late 1800s, William Cullen Bryant forbade the use of over in the sense of "more than," as in These rocks are over 5 million years old.Bryant provided no rationale for this injunction, but such was his stature that the stipulation was championed by other American editors, who also felt no reason to offer an explanation. Starting in the mid-1970s, equivalent metric capacities were also embossed on pieces, therefore any seen so-marked can be dated positively later than that.