How to | Type a Greek Letter
Selected examples from the video:
There are two main ways to type any special character in the Wolfram Language. You can use its full name or its alias.
To type a Greek letter (or any character) by its full name, start with a backslash and an open square bracket, followed by the name of the character:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-bptwga
Finish the character by typing a closing square bracket. As soon as you type the closing square bracket, the special character will be displayed:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-du2tnn
Here, the Greek letters beta and gamma are also entered. Note that like all built-in Wolfram Language functions, the names of the special characters are capitalized:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-h4v509
Finish typing gamma by entering the closing square bracket:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-npc8yu
To type capital Greek letters, use the prefix Capital. So to type a capital delta, you would type the following, but also include the closing square bracket:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-c9s0xv

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-cwwxlj
The other way to type a special character is by using its alias. An alias is usually a shorter way to type the character, which can often be more convenient.
To type an alias, press alias
, where alias represents the specific alias for the character you are entering. Much like the closing square bracket above, as soon as you press the
key a second time, the alias will display as the special character.
The Wolfram Language interprets the key as a series of three vertical dots. Here, the alias for alpha is entered without the second
key being pressed:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-g37d66
Aliases for Greek letters are the letters of the English alphabet. So alpha can be typed as a
, beta can be typed as
b
, and gamma can be typed as
g
. Here, the alias for gamma is entered without the second
key being pressed:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-bv2jte
The corresponding capital Greek letters can be typed with capitalized aliases, such as A
for capital alpha, and so on. The alias for capital alpha is entered here without the second
key being pressed:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-bvqvrj
A Greek letter in the Wolfram Language can also be entered by using its HTML name as an alias. So if you happen to know that α is the HTML command for alpha, you can type α
to enter it in the Wolfram Language.
Here, the HTML alias for alpha is entered without the second key being pressed:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-e53ak
The Greek letters are also all listed on the Special Characters palette, along with their full names and primary aliases.
Open the Special Characters palette from the Palettes menu:

If you mouse over a character, a tooltip will show the alias you can use to type in the character:

https://wolfram.com/xid/0rb21vt5n3co0ayamwqqxsdsi-6004t0
You can also enter a character directly from the palette by clicking it.