Greek letter delta. What is delta?

Today we'll talk about one great feature that a fairly small number of PC users know about. This may be surprising, but I've already seen a lot of how for simple copying, which is performed using the Ctrl-C key combination, people get scared by highlighting the desired fragment (more often a word) with the mouse, then press right key and select the "copy" item. An alternative option is to copy using the button located on the toolbar.

How do you usually insert characters into text that are not explicitly on the keyboard? The program "Symbol table" is called ( Win + R → charmap → Enter), there is a long and persistent search for the desired symbol, which is added. There is, perhaps, only one drawback to such a solution - it takes too long to look for it. I do not argue, sometimes you come across really "unprintable characters", but usually this is not required.

For a set Alt code hold down the Alt key (surprised?) and on numeric keypad(the one on the right, behind the arrows) press the indicated numbers one by one, after the Alt key is released. Problems can arise with shortened keyboards, which are common in laptops. In this case, as a rule, you need to additionally hold down the blue Fn key.

In the table below I tried to collect the most necessary symbols, supplemented by potentially useful ones. Besides Alt codes, there are also HTML mnemonics.

Menimonics is a construction that encodes special characters in a certain way. Looks like: & designation; - ampersand + symbol + semicolon.

There are contraindications for the arbitrary use of special signs from the table. It doesn't matter if the character is printed "as is" or by means of mnemonics, it can only be displayed if it is represented in the font used. Otherwise, you will see a rectangle, a question mark, and something else indicating no image for the specified symbol. Now this problem successfully solved thanks to pluggable fonts. But the authors of the texts need to keep in mind that a "Word" document typed in Calibri font will not always be fully displayed by a customer who uses a different operating system with its own set of preinstalled fonts. Safe can be considered "the most useful symbols”, But with fractions there may be problems.

How long does a paramotor last? The motors used are for agricultural use, so they are designed to withstand hundreds of hours with little maintenance. In fact, you can enjoy a multi-year paramotor in excellent condition.

Who can fly with a paramotor? Almost everyone only needs to be able to run a few meters with 20 kg from behind. To this we must add a few kilograms of gasoline, emergency parachutes and a sandwich. Sometimes they cost about half. Is it possible to use a professional paramotor?

Explanations about the signatures "for ru" and "for en". This is the current, active, input language. As a rule, the default switching is assigned to the Alt + Shift key combination.

When texts are replete with such "non-printable" characters, it is better to install a specialized editor that allows you to "program" the desired action for a certain key combination.

The word "delta" is borrowed into Russian from Greek (δέλτα). The term is used in various fields of science: linguistics, geography, mathematics and physics, astronomy.

Let's take a closer look at what a delta is.

Delta: values

1. First of all, delta is the name of the fourth letter of the Greek alphabet (Δ, δ). It comes from the Phoenician "Dalet" - "door", "entrance to the tent" (by external resemblance). It is this letter that is the ancestor of the Latin D and our letter D. In modern Greek, the letter is pronounced as an English voiced th (in ancient Greek it was pronounced in the same way as our D).
2. The letter δ is used as a symbol to denote variables (together with alpha, beta, gamma) in physics and mathematics. There is also a generalized physical and mathematical Dirac delta function.
3. The most famous definition of a delta is a part of land between the branches of a river at its mouth. This name is associated with the uppercase Greek letter Δ, because the delta resembles this letter. An example of the use of the word in this sense: "Malbork is a city in the north of Poland in the Vistula delta" (N. M. Karamzin).
4. Delta is also the colloquial name for the deltoid muscle (shoulder muscle), which is involved in flexion and extension of the arm in the shoulder, abduction of the arm to the side. The name, again, is associated with the triangular shape of the muscle, reminiscent of the Greek letter delta.
5. Previously, the constellation of the Triangle was called Delta.

As you can see, all meanings of the word are somehow connected with the triangular Greek letter Δ. By the way, an aircraft with triangular wings (delta shape) is called a hang glider.